Seattle to London flights
Round trip · Economy · Prices per person in USD
Prices updated
Prices are low right now
$422 is $402 (49%) below the usual $824 for Seattle → London.
Buy now or wait? We're still learning this route. We have 1 day of prices so far and need about a week to say whether to book or wait.
Not ready to book? Get an email when Seattle → London drops below your price.Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| September 2026 | No fares found yet |
| October 2026 | $785 |
| November 2026 | $422 (cheapest month) |
| December 2026 | No fares found yet |
| January 2027 | No fares found yet |
| February 2027 | No fares found yet |
| March 2027 | No fares found yet |
| April 2027 | No fares found yet |
| May 2027 | $824 |
| June 2027 | $973 |
| July 2027 | $1,159 |
Cheapest dates in the next 4 months
Round trip, per person-
Nov 7 – 21 14 nights · leave Sat$422 −49% vs usual$422 −49% vs usual Book
Icelandair 1 stop · 10h 55m -
Nov 15 – 22 7 nights · leave Sun$696 −16% vs usual$696 −16% vs usual Book
Icelandair 1 stop · 10h 55m
-
Oct 28 – Nov 4 7 nights · leave Wed$785 −5% vs usual$785 −5% vs usual Book
Icelandair 1 stop · 10h 55m
-
Oct 11 – 18 7 nights · leave Sun$871 +6% vs usual$871 +6% vs usual Book
Icelandair 2 stops · 12h 20m
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 .
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Airport transfer to London
Fixed prices from LHR on KiwitaxiTo see transfer prices here, turn on partner content in .
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Plan the rest of your trip
London · Nov 7 – 21Travel insurance · EKTA Airport transfer · Kiwitaxi
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Good to know
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Seattle to London: questions
How much is a flight from Seattle to London?
The cheapest round trip we have found right now is $422, leaving November 7 and returning November 21. The usual price on this route is about $824, so this fare is 49% less. Prices are per person, economy, in USD.
What is the cheapest month to fly from Seattle to London?
November 2026, with round trips from $422. The most expensive month in our data is July (from $1,159). Based on the 5 months ahead we have prices for.
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 $422, departing November 7 and returning November 21, about 49% below the usual $824. The cheapest month to fly in our data is November, from $422. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.