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Seattle → London

Dec 21, 2026 · return Jan 4, 2027

SEA → LHR1 adulteconomyRound trip

10 flight options · 6 airlines

Nonstop flights

Mon, Dec 21 – Mon, Jan 4

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 – Mon, Jan 4

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

Mon, Dec 21 – Mon, Jan 4

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 – Mon, Jan 4

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

One-stop flights

Mon, Dec 21 – Mon, Jan 4

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 – Mon, Jan 4

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 – Mon, Jan 4

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 – Mon, Jan 4

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 – Mon, Jan 4

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

Mon, Dec 21 – Mon, Jan 4

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

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 24, 2026 → Nov 29, 2026Dec 22, 2026 → Dec 27, 2026Dec 30, 2026 → Jan 2, 2027Jan 15, 2027 → Jan 18, 2027Oct 30, 2026 → Nov 2, 2026Oct 31, 2026 → Nov 7, 2026Nov 27, 2026 → Nov 30, 2026Nov 28, 2026 → Dec 5, 2026Dec 25, 2026 → Dec 28, 2026Dec 26, 2026 → Jan 2, 2027Jan 22, 2027 → Jan 25, 2027Oct 30, 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 → 2027-01-04Alaska AirlinesAS100 / AS101$1038.852026-10-29T01:15:29Z
2026-12-21 → 2027-01-04British AirwaysBA48 / BA49$1144.052026-10-29T01:15:29Z
2026-12-21 → 2027-01-04Delta Air LinesDL20 / DL21$1170.352026-10-29T01:15:29Z
2026-12-21 → 2027-01-04FIFI680 + FI450 / FI451 + FI681$815.302026-10-29T01:15:29Z
2026-12-21 → 2027-01-04Air FranceAF77 + AF1780 / AF1381 + AF76$1065.152026-10-29T01:15:29Z
2026-12-21 → 2027-01-04Air Canada / British AirwaysAC8807 + AC860 / BA49$1069.802026-10-29T01:15:29Z
2026-12-21 → 2027-01-04British AirwaysBA52 / BA49$1144.052026-10-29T01:15:29Z
2026-12-21 → 2027-01-04Alaska AirlinesAS460 + BA238 / AS101$1005.102026-10-29T01:15:29Z
2026-12-21 → 2027-01-04Alaska AirlinesAS385 + BA92 / AS101$1005.102026-10-29T01:15:29Z
2026-12-21 → 2027-01-04Alaska AirlinesAS442 + BA66 / AS101$1005.102026-10-29T01:15:29Z

2026-12-21 → 2027-01-04 · $1038.85

  • 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 2027-01-04 14:45:00 → SEA 2027-01-04 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $1144.05

  • 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 2027-01-04 14:55:00 → SEA 2027-01-04 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $1170.35

  • 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 2027-01-04 12:20:00 → SEA 2027-01-04 14:45:00; nonstop; 625 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $815.30

  • 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 2027-01-04 12:15:00 → SEA 2027-01-04 17:00:00; 1 stop(s) via KEF; 765 minutes. Local airport times.
    • FI451: LHR 2027-01-04 12:15:00 → KEF 2027-01-04 15:30:00; layover at KEF: 90 minutes.
    • FI681: KEF 2027-01-04 17:00:00 → SEA 2027-01-04 17:00:00.

2026-12-21 → 2027-01-04 · $1065.15

  • 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 2027-01-04 06:20:00 → SEA 2027-01-04 13:50:00; 1 stop(s) via CDG; 930 minutes. Local airport times.
    • AF1381: LHR 2027-01-04 06:20:00 → CDG 2027-01-04 08:40:00; layover at CDG: 225 minutes.
    • AF76: CDG 2027-01-04 12:25:00 → SEA 2027-01-04 13:50:00.

2026-12-21 → 2027-01-04 · $1069.80

  • 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 2027-01-04 14:55:00 → SEA 2027-01-04 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $1144.05

  • 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 2027-01-04 14:55:00 → SEA 2027-01-04 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $1005.10

  • 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 2027-01-04 14:45:00 → SEA 2027-01-04 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $1005.10

  • 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 2027-01-04 14:45:00 → SEA 2027-01-04 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $1005.10

  • 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 2027-01-04 14:45:00 → SEA 2027-01-04 17:00:00; nonstop; 615 minutes. Local airport times.

More dates for this route