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.

$336 CHEAP FLIGHTS from Washington to London

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Cheap Flights from Washington to London

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Washington to London

Tue, Jan 12 - Wed, Jan 13

5:00 am - 6:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 20m2 stops Denver Intl Newark

9:00 am - 10:57 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 57m2 stops Zurich San Francisco

$750United Airlines

Wed, Feb 17 - Wed, Feb 24

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

12:15 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$750Multiple Airlines

Sun, Apr 4 - Sun, Apr 18

5:45 pm - 7:10 pmSEA Seattle/Tacoma Intl-LGW London Gatwick

17h 25m1 stop Frankfurt am Main

10:30 am - 3:45 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

13h 15m1 stop Frankfurt am Main

$752Condor

Sun, Apr 4 - Sun, Apr 18

3:40 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

9:25 pm - 5:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 30m1 stop Reykjavik Keflavik Intl

$752Icelandair

Fri, Oct 30 - Sun, Nov 1

10:39 am - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 51m2 stops Chicago O'Hare Intl Kastrup Copenhagen

6:40 am - 9:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 24m2 stops Kastrup Copenhagen San Francisco

$752Scandinavian Airlines

Mon, Jan 11 - Mon, Jan 18

2:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

12:15 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$753Icelandair

Tue, Mar 2 - Fri, Mar 5

12:30 pm - 7:25 amGEG Spokane-LHR London Heathrow

34h 55m1 stop San Francisco

6:35 am - 11:38 pmLHR London Heathrow-GEG Spokane

25h 03m2 stops Munich Franz Josef Strauss San Francisco

$754United Airlines

Fri, Nov 13 - Mon, Nov 16

3:13 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 07m2 stops Los Angeles Kastrup Copenhagen

6:40 am - 11:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 20m2 stops Kastrup Copenhagen New York John F Kennedy Intl

$762Scandinavian Airlines

Wed, Jan 13 - Fri, Jan 15

7:00 am - 4:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

25h 50m2 stops Chicago O'Hare Intl Frankfurt am Main

2:30 pm - 2:37 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

32h 07m1 stop Vancouver Intl

$774Lufthansa

Tue, Jan 12 - Thu, Jan 14

7:00 am - 4:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

25h 50m2 stops Chicago O'Hare Intl Frankfurt am Main

2:30 pm - 9:32 amLHR London Heathrow-SEA Seattle/Tacoma Intl

27h 02m1 stop Vancouver Intl

$774Lufthansa

Recent last minute flight deals from Washington to London

Mon, Oct 12 - Mon, Oct 19

3:40 pm - 8:10 pmSEA Seattle/Tacoma Intl-LGW London Gatwick

20h 30m2 stops Reykjavik Keflavik Intl Oslo Gardermoen

9:00 pm - 8:40 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

31h 40m3 stops Bergen Flesland Oslo Gardermoen Reykjavik Keflavik Intl

$761Multiple Airlines

Fri, Oct 9 - Wed, Oct 14

6:50 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

30h 30m3 stops Munich Franz Josef Strauss Stockholm Arlanda Warsaw Frederic Chopin

9:05 pm - 10:47 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

33h 42m3 stops Stockholm Arlanda Zurich Vancouver Intl

$763Multiple Airlines

Mon, Oct 12 - Thu, Oct 22

3:40 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

9:25 pm - 8:40 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 15m1 stop Reykjavik Keflavik Intl

$818Icelandair

Tue, Oct 13 - Sat, Oct 31

7:00 pm - 8:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 20m1 stop Reykjavik Keflavik Intl

12:15 pm - 6:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$823Icelandair

Mon, Oct 12 - Thu, Oct 22

10:59 pm - 9:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

26h 36m2 stops New York John F Kennedy Intl Oslo Gardermoen

6:40 pm - 11:13 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

36h 33m2 stops Kastrup Copenhagen San Francisco

$824Scandinavian Airlines

Tue, Oct 13 - Sat, Oct 31

10:51 am - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 39m2 stops San Francisco Kastrup Copenhagen

6:40 am - 11:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 24m2 stops Kastrup Copenhagen New York John F Kennedy Intl

$851Scandinavian Airlines

Sun, Oct 11 - Tue, Oct 13

2:10 pm - 8:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

22h 30m1 stop Frankfurt am Main

5:50 pm - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 09m1 stop Munich Franz Josef Strauss

$887Lufthansa

Sun, Oct 11 - Tue, Oct 13

9:50 pm - 3:35 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

6:30 am - 11:52 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 22m1 stop Amsterdam Schiphol

$915KLM

Mon, Oct 12 - Mon, Oct 19

2:10 pm - 12:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 30m1 stop Frankfurt am Main

8:25 pm - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 34m1 stop Munich Franz Josef Strauss

$917Lufthansa

Tue, Oct 13 - Fri, Nov 6

9:50 pm - 3:35 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

6:30 am - 11:47 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 17m1 stop Amsterdam Schiphol

$996KLM

Recent direct flight deals from Washington to London

Thu, Dec 10 - Thu, Dec 31

1:40 pm - 7:10 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 30mnonstop

9:25 am - 11:25 amLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 00mnonstop

$836British Airways

Mon, Jan 18 - Mon, Feb 1

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$837Iberia

Wed, Feb 10 - Sun, Feb 14

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$837Multiple Airlines

Wed, Feb 10 - Mon, Feb 15

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$837British Airways

Tue, Jan 12 - Wed, Mar 10

6:40 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 40mnonstop

2:45 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 05mnonstop

$844Alaska Airlines

Sun, Jan 31 - Thu, Feb 4

6:50 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 30mnonstop

2:45 pm - 4:40 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$865Alaska Airlines

Mon, Nov 9 - Wed, Nov 25

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$881Virgin Atlantic

Tue, Mar 2 - Wed, Mar 17

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 5:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$892American Airlines

Tue, Mar 23 - Tue, Mar 30

7:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

9:50 am - 11:35 amLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 45mnonstop

$892American Airlines

Sun, Dec 6 - Thu, Dec 10

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$918Virgin Atlantic

Useful Info

Low season	January
High season	April
Cheapest flight	$336

Best time to beat the crowds with an average 1% drop in price.

Most popular time to fly and prices are also 17% lower on average.

Flight from Seattle to London Stansted Airport

MichaelFlew with Delta-May 2026

We like Delta, Alaska and American. Be prepared for a bit of a trek from your arrival gate to Customs and outside services. Heathrow doesn't rank high on my list of major airports.

Verified travelerFlew with American Airlines-Apr 2026

Heathrow is too gigantic to have less than 2 hours of layover time.

Verified travelerFlew with British Airways-Apr 2025

Make sure you have plenty of time between flights if you are delayed.

Verified travelerFlew with British Airways-Feb 2025

Don’t take a flight if you sick, or if you have no choice prepare to stay covered with mask throughout the flight

Verified travelerFlew with British Airways-Apr 2024

Bring a sack lunch -- airport food was very expensive.

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.

Hounslow

Hayes

Slough

Richmond

Wembley

Luton

Eastbourne

Ilford

Guildford

Kingston upon Thames

Bedford

Crawley

Watford

Harrow

Twickenham

Ipswich

St. Albans

Folkestone

Colchester

Woodbridge

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$336 Find Cheap Flights from Washington to London - Compare and Save

Cheap Flights from Washington to London

Recent round-trip flight deals from Washington to London

Recent one-way flight deals from Washington to London

Recent last minute flight deals from Washington to London

Recent direct flight deals from Washington to London

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

FAQs for booking flights from Washington to London

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