Seattle to London flights
The cheapest round trip we found from Seattle to London is $671 (Nov 29 – Dec 5, 1 stop).
SEA to LON · Round trip · Economy · Prices per person in USD · Price found (1 day ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $671 (cheapest month) |
| December 2026 | $899 |
Cheapest dates in the next 4 months
Round trip, per person-
Nov 29 – Dec 5 6 nights · leave Sun$671$671 Book
Icelandair 1 stop · 10h 50m -
Dec 10 – 14 4 nights · leave Thu$899$899 Book
Condor 2 stops · 13h 30m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in London
Tickets and tours on KlookTo see tours and tickets here, turn on partner content in .
Partner widget: we may earn a commission if you book, at no extra cost to you.
Airport transfer to London
Fixed prices from LHR on KiwitaxiTo see transfer prices here, turn on partner content in .
Partner widget: we may earn a commission if you book, at no extra cost to you.
Plan the rest of your trip
London · Nov 29 – Dec 5- eSIM for United Kingdom Yesim · prepaid mobile data (opens Yesim in a new tab)
- Car rental in United Kingdom Economybookings · compare rental companies (opens Economybookings in a new tab)
Partner links: we may earn a commission if you book, at no extra cost to you.
More from Seattle
-
-
-
-
-
-
- Ontario $175 −20%
-
Flights to London from other cities
All flights to London
Seattle to London: questions
How much does a flight from Seattle to London cost?
The cheapest round trip we have found right now is $671, leaving November 29 and returning December 5. Prices are per person, economy, in USD.
Which airports do Seattle to London flights use?
Seattle airports include Seattle-Tacoma International (SEA) and Boeing Field International (BFI). London airports include London Heathrow (LHR), London City (LCY) and London Gatwick (LGW). The prices on this page cover every airport in both cities (SEA and LON are the city codes).
About this route
We track round-trip economy fares from Seattle (United States) to London (United Kingdom) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $671, departing November 29 and returning December 5. The cheapest month to fly in our data is November, from $671. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.