Cheap flights from London to Seattle
✈️ Fares in August 2026 start from €509 — found by real travellers in the last 48 hours.
Compare all London → Seattle flights
Cheapest day to fly in August 2026
| Date | From | Stops | |
|---|---|---|---|
| Wed 12 Aug | €509 | 1 stop | Book → |
Popular flights from London
London to Paris · London to Rome · London to Milan · London to Berlin · London to Munich · London to Frankfurt · London to Amsterdam · London to Madrid · London to Barcelona · London to Lisbon · London to Vienna · London to Zurich
Flights to Seattle from other cities
Frequently asked questions
How much is a flight from London to Seattle?
Cached market fares for August 2026 start from €509 one-way. Prices are found by real travellers in the last 48 hours and confirmed at checkout.
Which airlines fly from London to Seattle?
Recent fares on this route are offered by FI and others. ScanFlyGo compares 1,200+ airlines and agencies.
What is the cheapest day to fly from London to Seattle?
ScanFlyGo shows the cheapest fare for each day of August 2026 — check the price table above to pick the cheapest date, then book directly with the provider.
Is London to Seattle a direct flight?
Both direct and connecting options may be available. Use the ScanFlyGo search to filter by stops, airline and time.
Can I track my London to Seattle flight live?
Yes. ScanFlyGo has a built-in live flight tracker with a real-time map, so you can follow your aircraft on the day by flight number.
Does ScanFlyGo charge booking or service fees?
No. ScanFlyGo is a free flight metasearch — we compare fares and send you to the airline or agency to book. The price is confirmed at their checkout with no extra fee from us.
About London to Seattle flights
ScanFlyGo compares London (All airports, LON) to Seattle (Seattle-Tacoma International Airport, SEA) fares across 1,200+ airlines and agencies via the Aviasales network. The cheapest fare found for August 2026 is €509. Prices shown are the lowest cached market fares; the final price is always confirmed at the partner's checkout. You can also search the return route Seattle → London, or use the full live search for exact dates, stops, airline filters and a live map to track your flight on the day.
Plan the rest of your trip to Seattle
Some links are affiliate links — we may earn a commission at no extra cost to you. Prices are estimates based on recent searches and may change.