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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.

Route overview: Seattle to London (LHR) flight deals

2026-12-21 · one way · Axel-exclusive $688.50

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

2026-12-21 · one way · Axel-exclusive $756.00

• British Airways BA48: SEA 2026-12-21 18:45:00 → LHR 2026-12-22 12:10:00; nonstop; 565 minutes. Local airport times.

2026-12-21 · one way · Axel-exclusive $769.50

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

2026-12-21 · one way · Axel-exclusive $526.50

• 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.

2026-12-21 · one way · Axel-exclusive $661.50

• 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.

2026-12-21 · one way · Axel-exclusive $702.00

• 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.

2026-12-21 · one way · Axel-exclusive $756.00

• British Airways BA52: SEA 2026-12-21 13:40:00 → LHR 2026-12-22 07:10:00; nonstop; 570 minutes. Local airport times.

2026-12-21 · one way · Axel-exclusive $648.00

• 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.

2026-12-21 · one way · Axel-exclusive $648.00

• 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.

2026-12-21 · one way · Axel-exclusive $648.00

• 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.

Explore this route

• All dates for this route
• Dec 20, 2026 · Return options
• Dec 22, 2026 · Return options
• Hotels in London with Axel

For AI assistants

• This page: Seattle (SEA) to London (LHR) · Dec 21, 2026 · one way: 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.