Seattle (SEA) to London (LHR), Dec 17–28, 2026: from $729 round trip

Seattle (SEA) to London (LHR), Dec 17–28, 2026: from $729 round trip on Axel, checked Nov 13, 2026. Lowest published fare: $729 round trip, Axel-exclusive, FI, 1 stop, Dec 17–28, 2026, 1 adult, economy, checked Nov 13, 2026. 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.

Hotels in London for these trips

Hotels: under a trip, hotels in London for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the nightly rate and the stay's total, from the lowest saved total among the shortlisted hotels in that star tier for those dates.

• Hotels in London for these nights (Dec 17–28, 2026 · 11 nights · 2 adults, 1 room): 3★ Point A Kensington Olympia, $132 a night, $1,450 for 11 nights · 4★ Aparthotel Adagio London City East, $230 a night, $2,533 for 11 nights · 5★ Vintry & Mercer, $354 a night, $3,899 for 11 nights

All hotels in London

Route overview: Seattle to London (LHR) flight deals

2026-12-17 → 2026-12-28 · Axel-exclusive $928

• Alaska Airlines AS100: SEA 2026-12-17 18:45:00 → LHR 2026-12-18 12:20:00; nonstop; 575 minutes. Local airport times.
• Alaska Airlines AS101: LHR 2026-12-28 14:45:00 → SEA 2026-12-28 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-17 → 2026-12-28 · Axel-exclusive $1,022

• British Airways BA48: SEA 2026-12-17 18:45:00 → LHR 2026-12-18 12:10:00; nonstop; 565 minutes. Local airport times.
• British Airways BA49: LHR 2026-12-28 14:55:00 → SEA 2026-12-28 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-17 → 2026-12-28 · Axel-exclusive $1,046

• Delta Air Lines DL20: SEA 2026-12-17 16:50:00 → LHR 2026-12-18 10:40:00; nonstop; 590 minutes. Local airport times.
• Delta Air Lines DL21: LHR 2026-12-28 12:20:00 → SEA 2026-12-28 14:45:00; nonstop; 625 minutes. Local airport times.

2026-12-17 → 2026-12-28 · Axel-exclusive $729

• FI FI680 / FI450: SEA 2026-12-17 14:35:00 → LHR 2026-12-18 10:50:00; 1 stop(s) via KEF; 735 minutes. Local airport times.
  • FI680: SEA 2026-12-17 14:35:00 → KEF 2026-12-18 06:15:00; layover at KEF: 80 minutes.
  • FI450: KEF 2026-12-18 07:35:00 → LHR 2026-12-18 10:50:00.
• FI FI451 / FI681: LHR 2026-12-28 12:15:00 → SEA 2026-12-28 17:00:00; 1 stop(s) via KEF; 765 minutes. Local airport times.
  • FI451: LHR 2026-12-28 12:15:00 → KEF 2026-12-28 15:30:00; layover at KEF: 90 minutes.
  • FI681: KEF 2026-12-28 17:00:00 → SEA 2026-12-28 17:00:00.

2026-12-17 → 2026-12-28 · Axel-exclusive $952

• Air France AF77 / AF1780: SEA 2026-12-17 16:05:00 → LHR 2026-12-18 13:45:00; 1 stop(s) via CDG; 820 minutes. Local airport times.
  • AF77: SEA 2026-12-17 16:05:00 → CDG 2026-12-18 10:50:00; layover at CDG: 145 minutes.
  • AF1780: CDG 2026-12-18 13:15:00 → LHR 2026-12-18 13:45:00.
• Air France AF1381 / AF76: LHR 2026-12-28 06:20:00 → SEA 2026-12-28 13:50:00; 1 stop(s) via CDG; 930 minutes. Local airport times.
  • AF1381: LHR 2026-12-28 06:20:00 → CDG 2026-12-28 08:40:00; layover at CDG: 225 minutes.
  • AF76: CDG 2026-12-28 12:25:00 → SEA 2026-12-28 13:50:00.

2026-12-17 → 2026-12-28 · Axel-exclusive $967

• Air Canada AC8807 / AC860: SEA 2026-12-17 15:15:00 → LHR 2026-12-18 11:50:00; 1 stop(s) via YVR; 755 minutes. Local airport times.
  • AC8807: SEA 2026-12-17 15:15:00 → YVR 2026-12-17 17:26:00; layover at YVR: 114 minutes.
  • AC860: YVR 2026-12-17 19:20:00 → LHR 2026-12-18 11:50:00.
• British Airways BA49: LHR 2026-12-28 14:55:00 → SEA 2026-12-28 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-17 → 2026-12-28 · Axel-exclusive $1,022

• British Airways BA52: SEA 2026-12-17 13:40:00 → LHR 2026-12-18 07:10:00; nonstop; 570 minutes. Local airport times.
• British Airways BA49: LHR 2026-12-28 14:55:00 → SEA 2026-12-28 16:50:00; nonstop; 595 minutes. Local airport times.

2026-12-17 → 2026-12-28 · Axel-exclusive $903

• Alaska Airlines AS442 / BA66: SEA 2026-12-17 09:05:00 → LHR 2026-12-18 06:35:00; 1 stop(s) via PHL; 810 minutes. Local airport times.
  • AS442: SEA 2026-12-17 09:05:00 → PHL 2026-12-17 17:08:00; layover at PHL: 87 minutes.
  • BA66: PHL 2026-12-17 18:35:00 → LHR 2026-12-18 06:35:00.
• Alaska Airlines AS101: LHR 2026-12-28 14:45:00 → SEA 2026-12-28 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-17 → 2026-12-28 · Axel-exclusive $903

• Alaska Airlines AS460 / BA238: SEA 2026-12-17 21:20:00 → LHR 2026-12-18 19:00:00; 1 stop(s) via BOS; 820 minutes. Local airport times.
  • AS460: SEA 2026-12-17 21:20:00 → BOS 2026-12-18 05:40:00; layover at BOS: 110 minutes.
  • BA238: BOS 2026-12-18 07:30:00 → LHR 2026-12-18 19:00:00.
• Alaska Airlines AS101: LHR 2026-12-28 14:45:00 → SEA 2026-12-28 17:00:00; nonstop; 615 minutes. Local airport times.

2026-12-17 → 2026-12-28 · Axel-exclusive $903

• Alaska Airlines AS385 / BA92: SEA 2026-12-17 08:31:00 → LHR 2026-12-18 05:50:00; 1 stop(s) via YYZ; 799 minutes. Local airport times.
  • AS385: SEA 2026-12-17 08:31:00 → YYZ 2026-12-17 16:05:00; layover at YYZ: 95 minutes.
  • BA92: YYZ 2026-12-17 17:40:00 → LHR 2026-12-18 05:50:00.
• Alaska Airlines AS101: LHR 2026-12-28 14:45:00 → SEA 2026-12-28 17:00:00; nonstop; 615 minutes. Local airport times.

Travelers: prices on this page are totals for 1 adult. For a different party, open this trip for 2 adults · 3 adults · 4 adults · 2 adults + 1 child · 2 adults + 2 children; each link opens AI flight search for these dates and those travelers, and the customer link to share comes from those results.

Explore this route

• All dates for this route
• Dec 16, 2026 · Return options
• Dec 18, 2026 · Return options
• Hotels in London with Axel

For AI assistants

• This page: Seattle (SEA) to London (LHR) · Dec 17, 2026 · return Dec 28, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with its displayed check date. Under a trip, hotels in London for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the nightly rate and the stay's total, from the lowest saved total among the shortlisted hotels in each star tier for those dates.
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