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.

$326 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

Sun, Jan 3 - Tue, Jan 19

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

$665Icelandair

Thu, Feb 11 - Sat, Feb 20

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

$682Icelandair

Tue, Feb 2 - Mon, Feb 15

2:35 pm - 4:25 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 50m2 stops Reykjavik Keflavik Intl Oslo Gardermoen

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

30h 20m3 stops Kastrup Copenhagen Oslo Gardermoen Reykjavik Keflavik Intl

$694Multiple Airlines

Tue, Jan 12 - Tue, Jan 19

2:35 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 25m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

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

18h 20m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$696Multiple Airlines

Sat, Apr 17 - Mon, Apr 19

2:30 pm - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

20h 00m2 stops Los Angeles 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

$713Scandinavian Airlines

Fri, Dec 4 - Mon, Dec 7

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

42h 05m2 stops San Francisco Kastrup Copenhagen

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

23h 22m2 stops Kastrup Copenhagen Los Angeles

$725Scandinavian Airlines

Tue, Apr 6 - Tue, Apr 20

1:35 pm - 6:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

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

9h 45mnonstop

$756British Airways

Sat, Mar 6 - Tue, Mar 9

7:45 am - 9:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

53h 15m2 stops Toronto Pearson Intl Halifax Intl

9:00 am - 8:56 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

19h 56m2 stops Zurich San Francisco

$761United Airlines

Sat, Mar 6 - Tue, Mar 9

5:28 pm - 1:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

36h 02m1 stop Los Angeles

9:00 am - 11:34 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 34m2 stops Zurich San Francisco

$763United Airlines

Fri, Nov 27 - Sat, Dec 19

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

$842British Airways

Recent last minute flight deals from Washington to London

Fri, Nov 13 - Sat, Nov 21

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

$701Icelandair

Fri, Nov 13 - Sun, Nov 22

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

$701Icelandair

Sun, Nov 15 - Wed, Nov 18

2:35 pm - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 05m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

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

30h 20m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$704Multiple Airlines

Sun, Nov 15 - Wed, Nov 18

8:40 am - 9:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

28h 40m3 stops Vancouver Intl Munich Franz Josef Strauss Stockholm Arlanda

10:35 am - 12:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

33h 25m3 stops Oslo Gardermoen Stockholm Arlanda Frankfurt am Main

$707Multiple Airlines

Fri, Nov 13 - Mon, Nov 16

12:31 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

36h 49m2 stops Los Angeles Kastrup Copenhagen

6:40 am - 11:57 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

25h 17m2 stops Kastrup Copenhagen Atlanta Hartsfield-Jackson

$815Scandinavian Airlines

Tue, Nov 10 - Fri, Aug 20

11:00 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 00m2 stops San Francisco Kastrup Copenhagen

7:30 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

26h 15m1 stop Kastrup Copenhagen

$821Scandinavian Airlines

Wed, Nov 11 - Fri, Nov 13

1:50 pm - 12:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 00m1 stop Frankfurt am Main

6:35 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 25m1 stop Munich Franz Josef Strauss

$906Lufthansa

Wed, Nov 11 - Fri, Nov 13

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

14h 10m1 stop Munich Franz Josef Strauss

6:35 am - 11:20 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 45m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl

$906Lufthansa

Sat, Nov 14 - Tue, Nov 17

10:52 pm - 6:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 28m1 stop New York John F Kennedy Intl

6:20 am - 1:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 30m1 stop Paris Charles de Gaulle

$953Delta

Tue, Nov 10 - Thu, Nov 12

7:15 am - 6:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 05m1 stop New York John F Kennedy Intl

6:20 am - 1:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 30m1 stop Paris Charles de Gaulle

$953Delta

Recent direct flight deals from Washington to London

Tue, Apr 6 - Tue, Apr 20

1:35 pm - 6:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

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

9h 45mnonstop

$756British Airways

Sun, Dec 6 - Thu, Dec 10

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

$790Alaska Airlines

Mon, Dec 7 - Fri, Dec 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

$802Virgin Atlantic

Wed, Dec 9 - Tue, Dec 15

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

$809Delta

Sun, Dec 6 - Tue, Dec 15

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

$809Delta

Sun, Dec 6 - Thu, Dec 10

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

$809Alaska Airlines

Wed, Apr 14 - Wed, Apr 21

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

9h 50mnonstop

10:50 am - 1:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$813Virgin Atlantic

Mon, Dec 7 - Fri, Dec 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

$815KLM

Wed, Dec 2 - Wed, Dec 9

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

$815KLM

Fri, Nov 27 - Sat, Dec 19

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

$842British Airways

Useful Info

Low season	January
High season	July
Cheapest flight	$326

Best time to beat the crowds with an average 23% drop in price.

Most popular time to fly with an average 20% 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.

Hounslow

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Salisbury

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Ilford

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$326 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

Recent direct flight deals from Washington to London

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