Flights from Seattle to London
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From $712 · Prices update daily
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The quick answer
A saved fare observation for Seattle to London was $332. Carrier in the saved observation: Icelandair. Cheapest month: October; peak: September (about +37%). Visa-free for US passport holders (Canada).
Saved route evidence
Fare snapshot
$332
Observed Jul 24, 2026. Prices can change.
Carriers in the saved observation
- Icelandair
Price calendar — next 60 days
★ Cheapest: $712 on Sun, Oct 11 · AS
Recently observed fares · Final price confirmed at booking
Price calendar — Seattle to London
Month-by-month lowest fares. Green = cheapest dates.
Airlines flying Seattle to London
Delta Air LinesApproximately $574 – $1,130 economy; Delta One business at a premium
Direct · about 9h 25m eastbound / 9h 45m westbound
Alaska AirlinesApproximately $620 – $1,180 economy; new 787-9 business suites at a premium
Direct · about 9h 25m eastbound / 9h 45m westbound
British AirwaysApproximately $600 – $1,160 economy; Club Suite business at a premium
Direct · about 9h 25m eastbound / 9h 45m westbound
Virgin AtlanticApproximately $610 – $1,170 economy; Upper Class at a premium
Direct · about 9h 25m eastbound / 9h 45m westbound
Flying to London? Compare from other US cities
Sometimes a nearby airport is cheaper. See London fares from other departure cities.
Canada essentials
🟢 Visa-free for US passport holders
No visa; UK ETA required (£20, since Feb 25 2026) for US passports
Full London visa guide →🆘 Emergency
911
💱 Currency
Canadian Dollar (C$)
🕐 Time zone
UTC−3.5 to −8
🗣️ Language
English, French
🔌 Plugs
Type A/B · 120V
🚗 Driving
Right side
💡 Tipping
Expected — 15–20%
📞 Dial code
+1
🏛️ US Embassy
Ottawa · +1 613-688-5335
Entry rules can change — always confirm with official sources before booking.
Stay connected in London
Skip roaming fees — get a local eSIM before you land. Works in 200+ countries and activates instantly, so you’re online the moment you touch down.
Travel insurance
Protect your Seattle to London trip against delays, cancellations, and medical emergencies. US travelers can compare plans from top insurers.
Airport transfer in London
Pre-book your ride into London. Fixed price, meet & greet, and a driver waiting at arrivals — no meter anxiety after a long flight.
Flight delayed or cancelled?
If your Seattle to London flight was delayed more than 3 hours or cancelled, you may be entitled to up to €600 in compensation under EU/UK rules — even if you flew a non-EU airline. Free to check, no win no fee.
More resources
Seattle to London — frequently asked
How much is a flight from Seattle to London?+
Fares start around $712 round-trip, ranging up to about $977 in peak periods. Prices update daily across 800+ airlines.
What is the cheapest month to fly Seattle to London?+
October typically has the lowest fares, while September is the most expensive (around +37%).
Are there direct flights from Seattle to London?+
No nonstop itinerary appeared in the saved route observation. Check current search results for your dates.
Which airlines fly from Seattle to London?+
Carriers on this route include Icelandair. Compare them side by side in the search above.
Do US citizens need a visa for Canada?+
Visa-free for US passport holders for stays up to 6 months. Visa-free for US citizens; passport required.
What currency is used in Canada?+
The Canadian Dollar (CAD, C$). The emergency number is 911.
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