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.

$336 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

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

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

Wed, Feb 10 - Mon, Feb 15

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

9h 25mnonstop

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

28h 25m1 stop Reykjavik Keflavik Intl

$752Multiple Airlines

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

Sun, Feb 7 - Sun, Mar 7

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

Tue, Mar 2 - Fri, Mar 5

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

41h 00m2 stops San Francisco Los Angeles

9:00 am - 11:38 pmLHR London Heathrow-GEG Spokane

22h 38m2 stops Zurich San Francisco

$756United 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

Sun, Dec 6 - Wed, Dec 9

8:30 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

40h 50m2 stops Atlanta Hartsfield-Jackson Kastrup Copenhagen

6:40 am - 8:24 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 44m2 stops Kastrup Copenhagen San Francisco

$766Scandinavian Airlines

Wed, Feb 3 - Fri, Feb 5

2:50 pm - 1:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 10m1 stop Munich Franz Josef Strauss

8:30 am - 9:02 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

20h 32m2 stops Frankfurt am Main Washington, D.C. Dulles Intl

$768Lufthansa

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

Recent last minute flight deals from Washington to London

Tue, Oct 13 - Mon, Oct 19

7:55 am - 9:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

29h 25m3 stops Toronto Pearson Intl Munich Franz Josef Strauss Stockholm Arlanda

9:05 pm - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

27h 54m2 stops Stockholm Arlanda Munich Franz Josef Strauss

$765Multiple Airlines

Tue, Oct 13 - Mon, Oct 19

5:50 am - 7:55 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

30h 05m3 stops Vancouver Intl Frankfurt am Main Stockholm Arlanda

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

33h 42m3 stops Stockholm Arlanda Frankfurt am Main Vancouver Intl

$790Multiple Airlines

Wed, Oct 14 - Wed, Oct 28

7:00 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 55m1 stop Reykjavik Keflavik Intl

8:35 pm - 6:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 25m1 stop Reykjavik Keflavik Intl

$821Icelandair

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

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

Thu, Oct 15 - Tue, Oct 20

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

23h 39m2 stops San Francisco Kastrup Copenhagen

6:40 am - 8:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 24m2 stops Kastrup Copenhagen San Francisco

$869Scandinavian Airlines

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

Sat, Oct 10 - Tue, Oct 13

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

34h 05m1 stop Vancouver Intl

9:00 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 59m1 stop Munich Franz Josef Strauss

$936Lufthansa

Sun, Oct 11 - Tue, Oct 13

5:30 pm - 11:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

6:15 am - 11:20 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 05m1 stop Paris Charles de Gaulle

$938Virgin Atlantic

Sun, Oct 11 - Thu, Oct 15

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

9h 45mnonstop

6:15 am - 11:15 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 00m1 stop Paris Charles de Gaulle

$979Virgin Atlantic

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

Wed, Feb 10 - Fri, Feb 19

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

$836British Airways

Mon, Jan 4 - Wed, Jan 13

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 - 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

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

Tue, Feb 2 - Mon, Feb 8

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

$845Alaska 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

Mon, Jan 11 - Tue, Jan 26

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

$892American Airlines

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

Fri, Nov 6 - Fri, Nov 13

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

$977Virgin Atlantic

Useful Info

Low season	January
High season	July
Cheapest flight	$336

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

Most popular time to fly with an average 24% 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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$336 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

Recent one-way flight deals from Washington to London

Recent last minute flight deals from Washington to London

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