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.

$320 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, Dec 8 - Mon, Dec 14

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

$753Icelandair

Tue, Dec 8 - Tue, Dec 15

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, Apr 6 - Fri, Apr 9

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

42h 00m2 stops Boston Logan Intl Kastrup Copenhagen

7:05 am - 10:02 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 57m2 stops Oslo Gardermoen New York John F Kennedy Intl

$753Scandinavian Airlines

Wed, Jan 13 - Wed, Jan 20

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

12h 35m1 stop Vancouver Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$753Multiple 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

Wed, Nov 25 - Tue, Dec 1

2:50 pm - 9:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 45m3 stops Munich Franz Josef Strauss Stockholm Arlanda Warsaw Frederic Chopin

6:40 pm - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

26h 20m3 stops Kastrup Copenhagen Stockholm Arlanda Munich Franz Josef Strauss

$754Multiple Airlines

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

$755United Airlines

Sun, Apr 11 - Thu, May 27

7:15 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 05m2 stops New York John F Kennedy Intl Kastrup Copenhagen

5:00 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 45m1 stop Kastrup Copenhagen

$756Scandinavian Airlines

Wed, Jan 13 - Fri, Jan 15

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

14h 10m1 stop Munich Franz Josef Strauss

6:30 am - 9:02 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 32m2 stops Frankfurt am Main Washington, D.C. Dulles Intl

$767Lufthansa

Wed, Feb 10 - Fri, Feb 12

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

14h 10m1 stop Munich Franz Josef Strauss

6:30 am - 10:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 15m2 stops Frankfurt am Main Chicago O'Hare Intl

$767Lufthansa

Recent last minute flight deals from Washington to London

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

7:50 pm - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 10m2 stops Oslo Gardermoen Frankfurt am Main

$787Multiple Airlines

Tue, Oct 20 - Wed, Nov 4

6:50 pm - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 50m2 stops Munich Franz Josef Strauss Kastrup Copenhagen

6:40 am - 8:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 19m2 stops Kastrup Copenhagen Toronto Pearson Intl

$788Multiple Airlines

Tue, Oct 20 - Thu, Nov 5

10:59 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

33h 01m2 stops New York John F Kennedy Intl Kastrup Copenhagen

6:40 pm - 10:05 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

35h 25m2 stops Kastrup Copenhagen Boston Logan Intl

$840Scandinavian Airlines

Tue, Oct 20 - Tue, Oct 27

10:59 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

33h 01m2 stops New York John F Kennedy Intl Kastrup Copenhagen

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

20h 24m2 stops Kastrup Copenhagen San Francisco

$850Scandinavian Airlines

Sun, Oct 18 - Wed, Nov 11

3:40 pm - 11:55 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

$857Icelandair

Sun, Oct 18 - Tue, Nov 17

3:40 pm - 11:55 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

$871Icelandair

Sun, Oct 18 - Tue, Oct 20

3:00 pm - 1:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 20m1 stop Vancouver Intl

6:30 am - 10:47 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 17m2 stops Frankfurt am Main Vancouver Intl

$887Lufthansa

Sun, Oct 18 - Tue, Oct 20

6:50 pm - 3:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 50m1 stop Munich Franz Josef Strauss

6:30 am - 12:20 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 50m1 stop Frankfurt am Main

$895Lufthansa

Tue, Oct 20 - Thu, Nov 5

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

$998KLM

Mon, Oct 19 - Thu, Oct 22

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

$998KLM

Recent direct flight deals from Washington to London

Wed, Feb 10 - Tue, Feb 16

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

Wed, Feb 17 - Mon, Feb 22

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

Wed, Feb 10 - Tue, Feb 16

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

$844Multiple Airlines

Sun, Jan 31 - Fri, Feb 26

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

$844Multiple Airlines

Tue, Jan 12 - Tue, Jan 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

$865British Airways

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

$865British Airways

Mon, Nov 9 - Tue, Nov 24

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

9h 25mnonstop

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

10h 00mnonstop

$869Finnair

Mon, Mar 1 - Tue, Mar 16

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

$871KLM

Tue, Mar 30 - Fri, Apr 30

3:00 pm - 8:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

5:45 pm - 8:03 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 18mnonstop

$896KLM

Sun, Nov 15 - Tue, Dec 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

$919Finnair

Useful Info

Low season	January
High season	July
Cheapest flight	$320

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

Most popular time to fly with an average 23% increase in price.

Flight from Spokane 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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$320 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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