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Seattle → London

Dec 21, 2026 · return Dec 24, 2026

SEA → LHR1 adulteconomyRound trip

10 flight options · 6 airlines

Nonstop flights

Mon, Dec 21 – Thu, Dec 24

Alaska Airlines
6:45 pmSEA
9h 35m
Nonstop
12:20 pm+1LHR
Alaska Airlines
2:45 pmLHR
10h 15m
Nonstop
5:00 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

British Airways
1:30 pmSEA
9h 30m
Nonstop
7:00 am+1LHR
British Airways
2:55 pmLHR
9h 55m
Nonstop
4:50 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

Delta Air Lines
4:50 pmSEA
9h 50m
Nonstop
10:40 am+1LHR
Delta Air Lines
12:20 pmLHR
10h 25m
Nonstop
2:45 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

British Airways
6:45 pmSEA
9h 25m
Nonstop
12:10 pm+1LHR
British Airways
2:55 pmLHR
9h 55m
Nonstop
4:50 pmSEA

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 – Thu, Dec 24

FI
2:35 pmSEA
12h 15m
KEF · 1h 20m
10:50 am+1LHR
FI
12:15 pmLHR
12h 45m
KEF · 1h 30m
5:00 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

Air France
4:05 pmSEA
13h 40m
CDG · 2h 25m
1:45 pm+1LHR
Air France
6:20 amLHR
15h 30m
CDG · 3h 45m
1:50 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

Air Canada
3:15 pmSEA
12h 35m
YVR · 1h 54m
11:50 am+1LHR
British Airways
2:55 pmLHR
9h 55m
Nonstop
4:50 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

Alaska Airlines
9:20 pmSEA
13h 40m
BOS · 1h 50m
7:00 pm+1LHR
Alaska Airlines
2:45 pmLHR
10h 15m
Nonstop
5:00 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

Alaska Airlines
9:05 amSEA
13h 30m
PHL · 1h 27m
6:35 am+1LHR
Alaska Airlines
2:45 pmLHR
10h 15m
Nonstop
5:00 pmSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

Alaska Airlines
8:31 amSEA
13h 19m
YYZ · 1h 35m
5:50 am+1LHR
Alaska Airlines
2:45 pmLHR
10h 15m
Nonstop
5:00 pmSEA

Round-trip total · 1 adult · Taxes included

Make this trip yours

SEA ⇄ LHR

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

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More dates

All dates for this routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 2026 · One way
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2026-12-24Alaska AirlinesAS100 / AS101$1066.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-24British AirwaysBA52 / BA49$1174.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-24Delta Air LinesDL20 / DL21$1201.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-24FIFI680 + FI450 / FI451 + FI681$837.002026-10-29T01:15:29Z
2026-12-21 → 2026-12-24Air FranceAF77 + AF1780 / AF1381 + AF76$1093.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-24Air Canada / British AirwaysAC8807 + AC860 / BA49$1100.252026-10-29T01:15:29Z
2026-12-21 → 2026-12-24British AirwaysBA48 / BA49$1174.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-24Alaska AirlinesAS460 + BA238 / AS101$1032.752026-10-29T01:15:29Z
2026-12-21 → 2026-12-24Alaska AirlinesAS442 + BA66 / AS101$1032.752026-10-29T01:15:29Z
2026-12-21 → 2026-12-24Alaska AirlinesAS385 + BA92 / AS101$1032.752026-10-29T01:15:29Z

2026-12-21 → 2026-12-24 · $1066.50

  • Alaska Airlines AS100: SEA 2026-12-21 18:45:00 → LHR 2026-12-22 12:20:00; nonstop; 575 minutes. Local airport times.
  • Alaska Airlines AS101: LHR 2026-12-24 14:45:00 → SEA 2026-12-24 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $1174.50

  • British Airways BA52: SEA 2026-12-21 13:30:00 → LHR 2026-12-22 07:00:00; nonstop; 570 minutes. Local airport times.
  • British Airways BA49: LHR 2026-12-24 14:55:00 → SEA 2026-12-24 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $1201.50

  • Delta Air Lines DL20: SEA 2026-12-21 16:50:00 → LHR 2026-12-22 10:40:00; nonstop; 590 minutes. Local airport times.
  • Delta Air Lines DL21: LHR 2026-12-24 12:20:00 → SEA 2026-12-24 14:45:00; nonstop; 625 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $837.00

  • FI FI680 / FI450: SEA 2026-12-21 14:35:00 → LHR 2026-12-22 10:50:00; 1 stop(s) via KEF; 735 minutes. Local airport times.
    • FI680: SEA 2026-12-21 14:35:00 → KEF 2026-12-22 06:15:00; layover at KEF: 80 minutes.
    • FI450: KEF 2026-12-22 07:35:00 → LHR 2026-12-22 10:50:00.
  • FI FI451 / FI681: LHR 2026-12-24 12:15:00 → SEA 2026-12-24 17:00:00; 1 stop(s) via KEF; 765 minutes. Local airport times.
    • FI451: LHR 2026-12-24 12:15:00 → KEF 2026-12-24 15:30:00; layover at KEF: 90 minutes.
    • FI681: KEF 2026-12-24 17:00:00 → SEA 2026-12-24 17:00:00.

2026-12-21 → 2026-12-24 · $1093.50

  • Air France AF77 / AF1780: SEA 2026-12-21 16:05:00 → LHR 2026-12-22 13:45:00; 1 stop(s) via CDG; 820 minutes. Local airport times.
    • AF77: SEA 2026-12-21 16:05:00 → CDG 2026-12-22 10:50:00; layover at CDG: 145 minutes.
    • AF1780: CDG 2026-12-22 13:15:00 → LHR 2026-12-22 13:45:00.
  • Air France AF1381 / AF76: LHR 2026-12-24 06:20:00 → SEA 2026-12-24 13:50:00; 1 stop(s) via CDG; 930 minutes. Local airport times.
    • AF1381: LHR 2026-12-24 06:20:00 → CDG 2026-12-24 08:40:00; layover at CDG: 225 minutes.
    • AF76: CDG 2026-12-24 12:25:00 → SEA 2026-12-24 13:50:00.

2026-12-21 → 2026-12-24 · $1100.25

  • Air Canada AC8807 / AC860: SEA 2026-12-21 15:15:00 → LHR 2026-12-22 11:50:00; 1 stop(s) via YVR; 755 minutes. Local airport times.
    • AC8807: SEA 2026-12-21 15:15:00 → YVR 2026-12-21 17:26:00; layover at YVR: 114 minutes.
    • AC860: YVR 2026-12-21 19:20:00 → LHR 2026-12-22 11:50:00.
  • British Airways BA49: LHR 2026-12-24 14:55:00 → SEA 2026-12-24 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $1174.50

  • British Airways BA48: SEA 2026-12-21 18:45:00 → LHR 2026-12-22 12:10:00; nonstop; 565 minutes. Local airport times.
  • British Airways BA49: LHR 2026-12-24 14:55:00 → SEA 2026-12-24 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $1032.75

  • Alaska Airlines AS460 / BA238: SEA 2026-12-21 21:20:00 → LHR 2026-12-22 19:00:00; 1 stop(s) via BOS; 820 minutes. Local airport times.
    • AS460: SEA 2026-12-21 21:20:00 → BOS 2026-12-22 05:40:00; layover at BOS: 110 minutes.
    • BA238: BOS 2026-12-22 07:30:00 → LHR 2026-12-22 19:00:00.
  • Alaska Airlines AS101: LHR 2026-12-24 14:45:00 → SEA 2026-12-24 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $1032.75

  • Alaska Airlines AS442 / BA66: SEA 2026-12-21 09:05:00 → LHR 2026-12-22 06:35:00; 1 stop(s) via PHL; 810 minutes. Local airport times.
    • AS442: SEA 2026-12-21 09:05:00 → PHL 2026-12-21 17:08:00; layover at PHL: 87 minutes.
    • BA66: PHL 2026-12-21 18:35:00 → LHR 2026-12-22 06:35:00.
  • Alaska Airlines AS101: LHR 2026-12-24 14:45:00 → SEA 2026-12-24 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $1032.75

  • Alaska Airlines AS385 / BA92: SEA 2026-12-21 08:31:00 → LHR 2026-12-22 05:50:00; 1 stop(s) via YYZ; 799 minutes. Local airport times.
    • AS385: SEA 2026-12-21 08:31:00 → YYZ 2026-12-21 16:05:00; layover at YYZ: 95 minutes.
    • BA92: YYZ 2026-12-21 17:40:00 → LHR 2026-12-22 05:50:00.
  • Alaska Airlines AS101: LHR 2026-12-24 14:45:00 → SEA 2026-12-24 17:00:00; nonstop; 615 minutes. Local airport times.

More dates for this route