$166 Find Cheap Flights from Washington to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to London departing on 10/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

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Flights Deals

Cheap Flights from Washington to London

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington to London

Tue, Aug 26 - Tue, Sep 2
 Logo
7:35 pm - 6:10 pmSEA-STN
14h 35m1 stop
 Logo
11:15 am - 5:50 pmSTN-SEA
14h 35m1 stop
Tue, Aug 26 - Tue, Sep 2
 Logo
7:35 pm - 10:10 pmSEA-LTN
18h 35m1 stop
 Logo
10:00 am - 5:50 pmLTN-SEA
15h 50m1 stop
Fri, Oct 3 - Thu, Oct 9
Scandinavian Airlines Logo
4:20 pm - 9:20 amSEA-LHR
33h 00m1 stop
Scandinavian Airlines Logo
5:30 pm - 2:00 pmLHR-SEA
28h 30m2 stops
$420Scandinavian Airlines
Find Deal
Fri, Oct 3 - Sat, Oct 11
Scandinavian Airlines Logo
4:20 pm - 9:20 amSEA-LHR
33h 00m1 stop
Scandinavian Airlines Logo
6:40 am - 2:00 pmLHR-SEA
39h 20m2 stops
$423Scandinavian Airlines
Find Deal
Sun, Aug 3 - Tue, Aug 19
Aer Lingus Logo
7:35 pm - 3:55 pmSEA-LHR
12h 20m1 stop
Aer Lingus Logo
1:25 pm - 5:50 pmLHR-SEA
12h 25m1 stop
$471Aer Lingus
Find Deal
Sun, Nov 9 - Wed, Nov 19
Aer Lingus Logo
8:05 pm - 7:50 pmSEA-LHR
15h 45m1 stop
Aer Lingus Logo
9:50 am - 6:20 pmLHR-SEA
16h 30m1 stop
$472Aer Lingus
Find Deal
Thu, Oct 2 - Sun, Oct 5
Icelandair Logo
7:00 pm - 2:40 pmSEA-LGW
11h 40m1 stop
Icelandair Logo
3:40 pm - 8:40 pmLGW-SEA
13h 00m1 stop
$478Icelandair
Find Deal
Mon, Oct 6 - Sun, Oct 19
Icelandair Logo
7:00 pm - 2:35 pmSEA-LGW
11h 35m1 stop
Icelandair Logo
3:40 pm - 5:50 pmLGW-SEA
34h 10m1 stop
$483Icelandair
Find Deal
Wed, Aug 6 - Wed, Aug 13
American Airlines Logo
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
American Airlines Logo
10:20 am - 4:00 pmLHR-SEA
13h 40m1 stop
$487American Airlines
Find Deal
Mon, Aug 4 - Wed, Aug 13
American Airlines Logo
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
American Airlines Logo
10:20 am - 4:00 pmLHR-SEA
13h 40m1 stop
$488American Airlines
Find Deal
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Good to know

Low seasonJanuary
High seasonJuly
Cheapest flight$166
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly with an average 24% increase in price.
Flight from Seattle to London Heathrow Airport

Flights from Washington to London: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Washington to London 
Verified travelerFlew with British AirwaysSEA-LHRApr 2025
Make sure you have plenty of time between flights if you are delayed.
Verified travelerFlew with British AirwaysSEA-LHRApr 2024
Bring a sack lunch -- airport food was very expensive.

FAQs for booking flights from Washington to London

  • How does KAYAK find such low prices on flights from Washington to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Washington is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Washington with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Ilford
Deal
Southall
St. Albans
Folkestone
Barnet
Bishop's Stortford
Ascot
Enfield
Ely
Rye
Edgware
Weybridge
Alton
Woodstock
Beaconsfield
Hatfield
Dorking
Burford
Epsom

Everything you need to know for your flight to London

Cabin class types available on flights to Washington

Cabin classes available on flights to London. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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