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Route overview: Seattle to London (LHR) flight deals

Seattle → London

Dec 13, 2026 · return Dec 17, 2026

SEA → LHR1 adulteconomyRound trip

10 flight options · 6 airlines

Nonstop flights

Sun, Dec 13 – Thu, Dec 17

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

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

British Airways
6:45 pmSEA
9h 25m
Nonstop
12:10 pm+1LHR
British Airways
9:25 amLHR
10h
Nonstop
11:25 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

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

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

British Airways
1:40 pmSEA
9h 30m
Nonstop
7:10 am+1LHR
British Airways
9:25 amLHR
10h
Nonstop
11:25 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

One-stop flights

Sun, Dec 13 – Thu, Dec 17

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

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

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

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

Air Canada
3:15 pmSEA
12h 35m
YVR · 1h 54m
11:50 am+1LHR
British Airways
9:25 amLHR
10h
Nonstop
11:25 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

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

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

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

Availability is checked when you select these flights.

Sun, Dec 13 – Thu, Dec 17

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

Availability is checked when you select these flights.

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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Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

Explore this route

All dates for this routeDec 12, 2026 · Return optionsDec 14, 2026 · Return optionsHotels in London with Axel
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.

See flights for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-13 → 2026-12-17Alaska AirlinesAS100 / AS101Axel-exclusive $790.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17British AirwaysBA48 / BA53Axel-exclusive $870.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17Delta Air LinesDL20 / DL21Axel-exclusive $890.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17FIFI680 + FI450 / FI451 + FI681Axel-exclusive $620.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17Air FranceAF77 + AF1780 / AF1381 + AF76Axel-exclusive $810.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17Air Canada / British AirwaysAC8807 + AC860 / BA53Axel-exclusive $815.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17British AirwaysBA52 / BA53Axel-exclusive $870.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17Alaska AirlinesAS385 + BA92 / AS101Axel-exclusive $765.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17Alaska AirlinesAS460 + BA238 / AS101Axel-exclusive $765.002026-10-29T01:15:29Z
2026-12-13 → 2026-12-17Alaska AirlinesAS442 + BA66 / AS101Axel-exclusive $765.002026-10-29T01:15:29Z

Route overview: Seattle to London (LHR) flight deals

2026-12-13 → 2026-12-17 · Axel-exclusive $790.00

  • Alaska Airlines AS100: SEA 2026-12-13 18:45:00 → LHR 2026-12-14 12:20:00; nonstop; 575 minutes. Local airport times.
  • Alaska Airlines AS101: LHR 2026-12-17 14:45:00 → SEA 2026-12-17 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $870.00

  • British Airways BA48: SEA 2026-12-13 18:45:00 → LHR 2026-12-14 12:10:00; nonstop; 565 minutes. Local airport times.
  • British Airways BA53: LHR 2026-12-17 09:25:00 → SEA 2026-12-17 11:25:00; nonstop; 600 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $890.00

  • Delta Air Lines DL20: SEA 2026-12-13 16:50:00 → LHR 2026-12-14 10:40:00; nonstop; 590 minutes. Local airport times.
  • Delta Air Lines DL21: LHR 2026-12-17 12:20:00 → SEA 2026-12-17 14:45:00; nonstop; 625 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $620.00

  • FI FI680 / FI450: SEA 2026-12-13 14:35:00 → LHR 2026-12-14 10:50:00; 1 stop(s) via KEF; 735 minutes. Local airport times.
    • FI680: SEA 2026-12-13 14:35:00 → KEF 2026-12-14 06:15:00; layover at KEF: 80 minutes.
    • FI450: KEF 2026-12-14 07:35:00 → LHR 2026-12-14 10:50:00.
  • FI FI451 / FI681: LHR 2026-12-17 12:15:00 → SEA 2026-12-17 17:00:00; 1 stop(s) via KEF; 765 minutes. Local airport times.
    • FI451: LHR 2026-12-17 12:15:00 → KEF 2026-12-17 15:30:00; layover at KEF: 90 minutes.
    • FI681: KEF 2026-12-17 17:00:00 → SEA 2026-12-17 17:00:00.

2026-12-13 → 2026-12-17 · Axel-exclusive $810.00

  • Air France AF77 / AF1780: SEA 2026-12-13 16:05:00 → LHR 2026-12-14 13:45:00; 1 stop(s) via CDG; 820 minutes. Local airport times.
    • AF77: SEA 2026-12-13 16:05:00 → CDG 2026-12-14 10:50:00; layover at CDG: 145 minutes.
    • AF1780: CDG 2026-12-14 13:15:00 → LHR 2026-12-14 13:45:00.
  • Air France AF1381 / AF76: LHR 2026-12-17 06:20:00 → SEA 2026-12-17 13:50:00; 1 stop(s) via CDG; 930 minutes. Local airport times.
    • AF1381: LHR 2026-12-17 06:20:00 → CDG 2026-12-17 08:40:00; layover at CDG: 225 minutes.
    • AF76: CDG 2026-12-17 12:25:00 → SEA 2026-12-17 13:50:00.

2026-12-13 → 2026-12-17 · Axel-exclusive $815.00

  • Air Canada AC8807 / AC860: SEA 2026-12-13 15:15:00 → LHR 2026-12-14 11:50:00; 1 stop(s) via YVR; 755 minutes. Local airport times.
    • AC8807: SEA 2026-12-13 15:15:00 → YVR 2026-12-13 17:26:00; layover at YVR: 114 minutes.
    • AC860: YVR 2026-12-13 19:20:00 → LHR 2026-12-14 11:50:00.
  • British Airways BA53: LHR 2026-12-17 09:25:00 → SEA 2026-12-17 11:25:00; nonstop; 600 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $870.00

  • British Airways BA52: SEA 2026-12-13 13:40:00 → LHR 2026-12-14 07:10:00; nonstop; 570 minutes. Local airport times.
  • British Airways BA53: LHR 2026-12-17 09:25:00 → SEA 2026-12-17 11:25:00; nonstop; 600 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $765.00

  • Alaska Airlines AS385 / BA92: SEA 2026-12-13 08:31:00 → LHR 2026-12-14 05:50:00; 1 stop(s) via YYZ; 799 minutes. Local airport times.
    • AS385: SEA 2026-12-13 08:31:00 → YYZ 2026-12-13 16:05:00; layover at YYZ: 95 minutes.
    • BA92: YYZ 2026-12-13 17:40:00 → LHR 2026-12-14 05:50:00.
  • Alaska Airlines AS101: LHR 2026-12-17 14:45:00 → SEA 2026-12-17 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $765.00

  • Alaska Airlines AS460 / BA238: SEA 2026-12-13 21:20:00 → LHR 2026-12-14 19:00:00; 1 stop(s) via BOS; 820 minutes. Local airport times.
    • AS460: SEA 2026-12-13 21:20:00 → BOS 2026-12-14 05:40:00; layover at BOS: 110 minutes.
    • BA238: BOS 2026-12-14 07:30:00 → LHR 2026-12-14 19:00:00.
  • Alaska Airlines AS101: LHR 2026-12-17 14:45:00 → SEA 2026-12-17 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $765.00

  • Alaska Airlines AS442 / BA66: SEA 2026-12-13 09:05:00 → LHR 2026-12-14 06:35:00; 1 stop(s) via PHL; 810 minutes. Local airport times.
    • AS442: SEA 2026-12-13 09:05:00 → PHL 2026-12-13 17:08:00; layover at PHL: 87 minutes.
    • BA66: PHL 2026-12-13 18:35:00 → LHR 2026-12-14 06:35:00.
  • Alaska Airlines AS101: LHR 2026-12-17 14:45:00 → SEA 2026-12-17 17:00:00; nonstop; 615 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Seattle (SEA) to London (LHR) · Dec 13, 2026 · return Dec 17, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Seattle to London (LHR) flight deals · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.