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.

$322 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

Thu, Mar 11 - Thu, Mar 18

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

20h 55m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$751Icelandair

Thu, Dec 3 - Fri, Dec 11

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

20h 55m1 stop Reykjavik Keflavik Intl

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

28h 25m1 stop Reykjavik Keflavik Intl

$751Icelandair

Mon, Jan 18 - Wed, Jan 20

1:50 pm - 4:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

19h 00m1 stop Frankfurt am Main

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

14h 25m1 stop Munich Franz Josef Strauss

$753United Airlines

Mon, Jan 11 - Wed, Jan 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

$753United Airlines

Tue, Nov 3 - Sat, Nov 7

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

29h 00m3 stops Vancouver Intl Toronto Pearson Intl Kastrup Copenhagen

10:35 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

34h 25m3 stops Oslo Gardermoen Kastrup Copenhagen Munich Franz Josef Strauss

$755Multiple Airlines

Sun, Mar 21 - Tue, Mar 30

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

9h 25mnonstop

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

31h 15m1 stop Reykjavik Keflavik Intl

$756Multiple Airlines

Sun, Jan 10 - Tue, Jan 12

1:50 pm - 6:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

20h 55m1 stop Frankfurt am Main

5:50 pm - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

27h 10m1 stop Munich Franz Josef Strauss

$758Lufthansa

Fri, Nov 6 - Mon, Nov 9

12:30 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

43h 30m2 stops Los Angeles Kastrup Copenhagen

10:20 am - 11:26 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

45h 06m2 stops Kastrup Copenhagen San Francisco

$767Scandinavian Airlines

Fri, Dec 4 - Sun, Dec 6

3:21 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

33h 59m2 stops Los Angeles Kastrup Copenhagen

6:40 pm - 11:24 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

36h 44m2 stops Kastrup Copenhagen San Francisco

$767Scandinavian Airlines

Tue, Jan 19 - Thu, Jan 21

7:00 am - 2:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 45m2 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

$775Lufthansa

Recent last minute flight deals from Washington to London

Mon, Oct 5 - Fri, Nov 13

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

32h 55m1 stop Reykjavik Keflavik Intl

7:40 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 20m1 stop Munich Franz Josef Strauss

$781Multiple Airlines

Mon, Oct 5 - Tue, Oct 13

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

32h 55m1 stop Reykjavik Keflavik Intl

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

28h 30m1 stop Reykjavik Keflavik Intl

$791Icelandair

Mon, Oct 5 - Mon, Nov 9

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

32h 55m1 stop Reykjavik Keflavik Intl

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

28h 25m1 stop Reykjavik Keflavik Intl

$791Icelandair

Sun, Oct 4 - Sat, Oct 10

3:55 pm - 5:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 45m1 stop Kastrup Copenhagen

6:40 am - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 05m1 stop Kastrup Copenhagen

$792Scandinavian Airlines

Fri, Oct 2 - Mon, Oct 5

3:55 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

33h 25m1 stop Kastrup Copenhagen

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

28h 45m1 stop Kastrup Copenhagen

$816Scandinavian Airlines

Tue, Oct 6 - Fri, Nov 13

3:55 pm - 5:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 45m1 stop Kastrup Copenhagen

7:40 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 20m1 stop Munich Franz Josef Strauss

$848Multiple Airlines

Mon, Oct 5 - Wed, Oct 7

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

16h 30m1 stop Frankfurt am Main

10:50 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 09m1 stop Munich Franz Josef Strauss

$859Lufthansa

Mon, Oct 5 - Wed, Oct 7

10:50 am - 4:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 50m2 stops Vancouver Intl Frankfurt am Main

10:50 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 09m1 stop Munich Franz Josef Strauss

$872Lufthansa

Mon, Oct 5 - Wed, Oct 7

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 5 - Tue, Nov 10

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

Recent direct flight deals from Washington to London

Sun, Feb 21 - Sun, Feb 28

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

9h 30mnonstop

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

9h 55mnonstop

$835Multiple Airlines

Mon, Feb 15 - Mon, Feb 22

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, Feb 9 - Thu, Feb 18

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

9h 30mnonstop

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

9h 55mnonstop

$837Multiple Airlines

Tue, Jan 5 - Tue, Jan 12

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

Wed, Mar 3 - Wed, Mar 17

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

9h 30mnonstop

2:45 pm - 5:40 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$844Alaska Airlines

Wed, Feb 24 - Wed, Mar 3

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

$844Alaska Airlines

Mon, Nov 9 - Wed, Nov 25

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

$879Finnair

Mon, Nov 2 - Wed, Nov 18

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

$883Virgin Atlantic

Mon, Nov 2 - Mon, Nov 16

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

$885Virgin Atlantic

Wed, Dec 2 - Wed, Dec 9

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

$899Finnair

Useful Info

Low season	January
High season	July
Cheapest flight	$322

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 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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$322 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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