All airlines flying from Seattle-Tacoma (SEA) to London Heathrow (LHR).

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FLIGHT SCHEDULE
Direct Codeshare Flights:
Tue,Fri,Sat 18:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 787-9 (789) 9:30 Effective 2026-03-03 through 2026-03-07 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Wed,Thu 18:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 787 (787) 9:30 Effective 2026-03-04 through 2026-03-05 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 787 (787) 9:30 Effective 2026-03-08 through 2026-03-22 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Mon-Fri 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 787-9 (789) 9:30 Effective 2026-03-23 through 2026-03-27 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Sat 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 777 (777) 9:30 Operates only on 2026-10-24 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 787 (787) 9:30 Effective from 2026-10-25 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Sat 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 787 (787) 9:25 Operates only on 2026-03-28 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 777 (777) 9:25 Effective 2026-03-29 through 2026-08-31 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 787 (787) 9:25 Effective 2026-09-01 through 2026-09-30 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Alaska Airlines AS 5270 Non-stop Boeing 777 (777) 9:25 Effective 2026-10-01 through 2026-10-23 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Tue 13:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Valid until 2026-02-03 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Tue 13:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Effective 2026-02-17 through 2026-03-03 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Fri,Sat 13:35 Seattle-Tacoma (SEA) 07:10 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Valid until 2026-03-07 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Mon 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 787-9 (789) 9:15 Operates only on 2026-03-30 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Mon,Wed 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 787 (787) 9:15 Effective 2026-04-01 through 2026-04-08 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Mon-Fri,Sun 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 787 (787) 9:15 Effective 2026-04-10 through 2026-04-17 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Daily 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 787 (787) 9:15 Effective 2026-04-18 through 2026-10-23 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Sat 13:35 Seattle-Tacoma (SEA) 05:50 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 787 (787) 9:15 Operates only on 2026-10-24 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Tue 14:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Effective 2026-03-10 through 2026-03-24 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Tue 14:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Operates only on 2026-10-27 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Fri,Sat 14:35 Seattle-Tacoma (SEA) 07:10 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Effective 2026-03-13 through 2026-03-27 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Sat 14:35 Seattle-Tacoma (SEA) 08:10 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Operates only on 2026-03-28 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Fri,Sat 14:35 Seattle-Tacoma (SEA) 07:10 London Heathrow (LHR) 5 Alaska Airlines AS 5272 Non-stop Boeing 777 (777) 9:35 Effective from 2026-10-30 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Daily 18:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-10 (781) 9:30 Valid until 2026-03-02 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Tue,Fri,Sat 18:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-9 (789) 9:30 Effective 2026-03-03 through 2026-03-07 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Wed,Thu 18:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-10 (781) 9:30 Effective 2026-03-04 through 2026-03-05 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-10 (781) 9:30 Effective 2026-03-08 through 2026-03-22 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Mon-Fri 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-9 (789) 9:30 Effective 2026-03-23 through 2026-03-27 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Sat 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 777-300ER (77W) 9:30 Operates only on 2026-10-24 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 19:50 Seattle-Tacoma (SEA) 12:20 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-10 (781) 9:30 Effective from 2026-10-25 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Sat 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-8 (788) 9:25 Operates only on 2026-03-28 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 777-300ER (77W) 9:25 Effective 2026-03-29 through 2026-04-21 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 777 (777) 9:25 Effective 2026-04-22 through 2026-04-30 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 777-300ER (77W) 9:25 Effective 2026-05-01 through 2026-08-31 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 787-10 (781) 9:25 Effective 2026-09-01 through 2026-09-30 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Daily 20:20 Seattle-Tacoma (SEA) 13:45 London Heathrow (LHR) 5 Finnair AY 5448 Non-stop Boeing 777-300ER (77W) 9:25 Effective 2026-10-01 through 2026-10-23 Codeshare flight, operated by British Airways.(BA 48) The flight arrives 1 day after departure.
Tue 13:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Valid until 2026-02-03 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Tue 13:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Effective 2026-02-17 through 2026-03-03 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Fri,Sat 13:35 Seattle-Tacoma (SEA) 07:10 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Valid until 2026-03-07 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Mon 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 787-9 (789) 9:15 Operates only on 2026-03-30 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Mon,Wed 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 787-10 (781) 9:15 Effective 2026-04-01 through 2026-04-08 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Mon-Fri,Sun 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 787-10 (781) 9:15 Effective 2026-04-10 through 2026-04-17 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Daily 13:35 Seattle-Tacoma (SEA) 06:50 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 787-10 (781) 9:15 Effective 2026-04-18 through 2026-10-23 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Sat 13:35 Seattle-Tacoma (SEA) 05:50 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 787-10 (781) 9:15 Operates only on 2026-10-24 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Tue 14:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Effective 2026-03-10 through 2026-03-24 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Tue 14:25 Seattle-Tacoma (SEA) 07:00 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Operates only on 2026-10-27 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Fri,Sat 14:35 Seattle-Tacoma (SEA) 07:10 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Effective 2026-03-13 through 2026-03-27 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Sat 14:35 Seattle-Tacoma (SEA) 08:10 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Operates only on 2026-03-28 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Fri,Sat 14:35 Seattle-Tacoma (SEA) 07:10 London Heathrow (LHR) 5 Finnair AY 5450 Non-stop Boeing 777 (777) 9:35 Effective from 2026-10-30 Codeshare flight, operated by British Airways.(BA 52) The flight arrives 1 day after departure.
Daily 15:05 Seattle-Tacoma (SEA) 07:35 London Heathrow (LHR) 3 Delta Air Lines DL 5974 Non-stop Boeing 787-9 (789) 9:30 Effective from 2026-10-25 Codeshare flight, operated by Virgin Atlantic.(VS 106) The flight arrives 1 day after departure.

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An international route departing from Seattle-Tacoma airport, United States (SEA) and arriving at London Heathrow airport, United Kingdom (LHR).
The flight distance is 4783 miles, or 7697 km.
The timezone of the departure airport is UTC-8 , and the timezone of the arrival airport is UTC+0 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 8:45 and 10:50.

Return (LHR-SEA) flights

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All airlines flying from Seattle-Tacoma (SEA) to London Heathrow (LHR).

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FLIGHT SCHEDULE

Direct Codeshare Flights:

Alaska Airlines AS5270

18:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-03 through 2026-03-07

Mon
-

Tue

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-9 (789)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

18:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-04 through 2026-03-05

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-08 through 2026-03-22

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-23 through 2026-03-27

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-9 (789)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Operates only on 2026-10-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective from 2026-10-25

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Operates only on 2026-03-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-03-29 through 2026-08-31

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-09-01 through 2026-09-30

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5270

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-10-01 through 2026-10-23

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Valid until 2026-02-03

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Effective 2026-02-17 through 2026-03-03

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:35

Seattle-Tacoma (SEA)

07:10(+1)

London Heathrow (LHR) 5

Valid until 2026-03-07

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Operates only on 2026-03-30

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787-9 (789)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Effective 2026-04-01 through 2026-04-08

Mon

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Effective 2026-04-10 through 2026-04-17

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Effective 2026-04-18 through 2026-10-23

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

13:35

Seattle-Tacoma (SEA)

05:50(+1)

London Heathrow (LHR) 5

Operates only on 2026-10-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787 (787)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

14:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Effective 2026-03-10 through 2026-03-24

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

14:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Operates only on 2026-10-27

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

14:35

Seattle-Tacoma (SEA)

07:10(+1)

London Heathrow (LHR) 5

Effective 2026-03-13 through 2026-03-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

14:35

Seattle-Tacoma (SEA)

08:10(+1)

London Heathrow (LHR) 5

Operates only on 2026-03-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Alaska Airlines AS5272

14:35

Seattle-Tacoma (SEA)

07:10(+1)

London Heathrow (LHR) 5

Effective from 2026-10-30

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

18:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Valid until 2026-03-02

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

18:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-03 through 2026-03-07

Mon
-

Tue

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-9 (789)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

18:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-04 through 2026-03-05

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-08 through 2026-03-22

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective 2026-03-23 through 2026-03-27

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-9 (789)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Operates only on 2026-10-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 777-300ER (77W)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

19:50

Seattle-Tacoma (SEA)

12:20(+1)

London Heathrow (LHR) 5

Effective from 2026-10-25

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:30, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Operates only on 2026-03-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 787-8 (788)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-03-29 through 2026-04-21

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 777-300ER (77W)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-04-22 through 2026-04-30

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-05-01 through 2026-08-31

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 777-300ER (77W)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-09-01 through 2026-09-30

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5448

20:20

Seattle-Tacoma (SEA)

13:45(+1)

London Heathrow (LHR) 5

Effective 2026-10-01 through 2026-10-23

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 48)

Duration: 9:25, non-stop
Boeing 777-300ER (77W)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Valid until 2026-02-03

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Effective 2026-02-17 through 2026-03-03

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:35

Seattle-Tacoma (SEA)

07:10(+1)

London Heathrow (LHR) 5

Valid until 2026-03-07

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Operates only on 2026-03-30

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787-9 (789)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Effective 2026-04-01 through 2026-04-08

Mon

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Effective 2026-04-10 through 2026-04-17

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:35

Seattle-Tacoma (SEA)

06:50(+1)

London Heathrow (LHR) 5

Effective 2026-04-18 through 2026-10-23

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

13:35

Seattle-Tacoma (SEA)

05:50(+1)

London Heathrow (LHR) 5

Operates only on 2026-10-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:15, non-stop
Boeing 787-10 (781)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

14:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Effective 2026-03-10 through 2026-03-24

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

14:25

Seattle-Tacoma (SEA)

07:00(+1)

London Heathrow (LHR) 5

Operates only on 2026-10-27

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

14:35

Seattle-Tacoma (SEA)

07:10(+1)

London Heathrow (LHR) 5

Effective 2026-03-13 through 2026-03-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

14:35

Seattle-Tacoma (SEA)

08:10(+1)

London Heathrow (LHR) 5

Operates only on 2026-03-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Finnair AY5450

14:35

Seattle-Tacoma (SEA)

07:10(+1)

London Heathrow (LHR) 5

Effective from 2026-10-30

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 52)

Duration: 9:35, non-stop
Boeing 777 (777)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Delta Air Lines DL5974

15:05

Seattle-Tacoma (SEA)

07:35(+1)

London Heathrow (LHR) 3

Effective from 2026-10-25

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Codeshare flight, operated by Virgin Atlantic. (VS 106)

Duration: 9:30, non-stop
Boeing 787-9 (789)
The flight arrives 1 day after departure.

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An international route departing from Seattle-Tacoma airport, United States (SEA) and arriving at London Heathrow airport, United Kingdom (LHR).
The flight distance is 4783 miles, or 7697 km.
The timezone of the departure airport is UTC-8 , and the timezone of the arrival airport is UTC+0 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 8:45 and 10:50.

Return (LHR-SEA) flights

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