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

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 Heathrow Airport.

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport 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 Heathrow Airport?

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 Heathrow Airport 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 Heathrow Airport?

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 Heathrow Airport from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$334 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

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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, 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

Mon, Nov 16 - Mon, Nov 23

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

12h 15m1 stop Reykjavik Keflavik Intl

8:35 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 25m1 stop Reykjavik Keflavik Intl

$755Icelandair

Fri, Feb 26 - Sun, Feb 28

7:20 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 40m2 stops Chicago O'Hare Intl Kastrup Copenhagen

6:40 am - 10:02 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 22m2 stops Kastrup Copenhagen New York John F Kennedy Intl

$755Scandinavian Airlines

Sun, Feb 14 - Sun, Feb 21

3:15 pm - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 35m1 stop Vancouver Intl

8:35 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 25m1 stop Reykjavik Keflavik Intl

$755Multiple Airlines

Mon, Nov 16 - Mon, Nov 30

2:35 pm - 9:35 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 00m2 stops Reykjavik Keflavik Intl Oslo Gardermoen

5:50 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 10m3 stops Amsterdam Schiphol Oslo Gardermoen Reykjavik Keflavik Intl

$755Multiple Airlines

Tue, Jan 5 - Tue, Jan 19

2:35 pm - 7:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

20h 55m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$755Icelandair

Mon, Mar 29 - Wed, Mar 31

6:50 pm - 5:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 15m1 stop Munich Franz Josef Strauss

6:30 am - 11:55 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 25m1 stop Frankfurt am Main

$757Lufthansa

Tue, Mar 2 - Fri, Mar 5

12:30 pm - 1:30 pmGEG Spokane-LHR London Heathrow

41h 00m2 stops San Francisco Los Angeles

6:35 am - 8:59 pmLHR London Heathrow-GEG Spokane

22h 24m2 stops Munich Franz Josef Strauss San Francisco

$758United 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

$761Scandinavian Airlines

Sun, Nov 15 - Tue, Nov 17

1:50 pm - 8:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 00m1 stop Frankfurt am Main

8:15 pm - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 45m1 stop Munich Franz Josef Strauss

$767Lufthansa

Recent last minute flight deals from Washington to London

Sun, Oct 25 - Tue, Nov 10

7:10 pm - 9:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

31h 25m3 stops Reykjavik Keflavik Intl Stockholm Arlanda Oslo Gardermoen

6:40 am - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

18h 20m2 stops Stockholm Arlanda Reykjavik Keflavik Intl

$798Multiple Airlines

Tue, Oct 20 - Tue, Oct 27

10:50 am - 9:35 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

26h 45m3 stops Vancouver Intl Munich Franz Josef Strauss Oslo Gardermoen

10:35 am - 2:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

34h 25m2 stops Oslo Gardermoen Munich Franz Josef Strauss

$860Multiple Airlines

Sun, Oct 25 - Tue, Nov 10

7:10 pm - 7:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 20m1 stop Reykjavik Keflavik Intl

8:35 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 25m1 stop Reykjavik Keflavik Intl

$869Icelandair

Sun, Oct 25 - Tue, Nov 10

7:10 pm - 7:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 20m1 stop Reykjavik Keflavik Intl

8:35 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 25m1 stop Reykjavik Keflavik Intl

$872Icelandair

Sun, Oct 25 - Sat, Oct 31

7:24 am - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

31h 16m2 stops Boston Logan Intl 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

$880Scandinavian Airlines

Sun, Oct 25 - Tue, Nov 3

7:24 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

25h 36m2 stops Boston Logan Intl Kastrup Copenhagen

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

36h 24m2 stops Kastrup Copenhagen New York John F Kennedy Intl

$880Scandinavian Airlines

Tue, Oct 20 - Fri, Oct 23

7:15 pm - 1:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 05m1 stop Vancouver Intl

6:55 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

18h 04m1 stop Munich Franz Josef Strauss

$935Lufthansa

Tue, Oct 20 - Fri, Oct 23

7:15 pm - 1:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 05m1 stop Vancouver Intl

6:55 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

18h 04m1 stop Munich Franz Josef Strauss

$936Lufthansa

Tue, Oct 20 - Tue, Oct 27

9:40 pm - 3:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:45 pm - 6:05 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$966Alaska Airlines

Tue, Oct 20 - Tue, Nov 3

9:40 pm - 3:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:45 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 15mnonstop

$966Alaska Airlines

Recent direct flight deals from Washington to London

Wed, Dec 2 - Wed, Dec 9

6:45 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 35mnonstop

2:45 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 15mnonstop

$767Alaska Airlines

Wed, Dec 2 - Wed, Dec 9

6:45 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 35mnonstop

2:45 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 15mnonstop

$785Alaska Airlines

Tue, Feb 16 - Wed, Mar 24

4:55 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

2:45 pm - 5:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 05mnonstop

$827Multiple Airlines

Tue, Mar 2 - Mon, Mar 8

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

9h 25mnonstop

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

10h 05mnonstop

$830Multiple Airlines

Wed, Feb 3 - Wed, Feb 24

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

$840British Airways

Wed, Jan 27 - Wed, Feb 10

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

$840British Airways

Tue, Mar 2 - Tue, Mar 9

5:00 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 40mnonstop

12:20 pm - 2:39 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 19mnonstop

$842KLM

Wed, Mar 10 - Wed, Mar 17

5:00 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 40mnonstop

12:20 pm - 3:39 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 19mnonstop

$842KLM

Wed, Mar 10 - Wed, Mar 17

5:00 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 40mnonstop

12:20 pm - 3:39 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 19mnonstop

$842Air France

Tue, Jan 19 - Fri, Jan 29

4:55 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

12:20 pm - 2:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 25mnonstop

$842Air France

Useful Info

Low season	January
High season	July
Cheapest flight	$334

Best time to beat the crowds with an average 24% drop in price.

Most popular time to fly with an average 22% increase in price.

Flight from Seattle to London Heathrow 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 Heathrow Airport?
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 Heathrow Airport.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London Heathrow Airport?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport 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 Heathrow Airport?
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 Heathrow Airport 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 Heathrow Airport?
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 Heathrow Airport from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

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$334 Find Cheap Flights from Washington to London Heathrow Airport - Compare and Save

Cheap Flights from Washington to London

Recent round-trip flight deals from Washington to London

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Recent last minute flight deals from Washington to London

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