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.

$291 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

Fri, Sep 25 - Wed, Oct 7

3:55 pm - 8:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

33h 00m2 stops Kastrup Copenhagen Stockholm Arlanda

6:05 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

51h 40m2 stops Stockholm Arlanda Kastrup Copenhagen

$739Scandinavian Airlines

Sat, Oct 24 - Sun, Nov 1

7:10 pm - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

19h 30m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

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

28h 25m1 stop Reykjavik Keflavik Intl

$739Multiple Airlines

Wed, Feb 17 - Wed, Feb 24

10:10 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 10m2 stops Vancouver Intl Calgary

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

12h 45m1 stop Reykjavik Keflavik Intl

$739Multiple Airlines

Tue, Sep 22 - Sat, Oct 10

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

17h 45m1 stop Kastrup Copenhagen

1:55 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 50m2 stops Stockholm Arlanda Kastrup Copenhagen

$740Scandinavian Airlines

Thu, Jan 14 - Mon, Jan 18

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

$742Icelandair

Fri, Nov 13 - Wed, Nov 18

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

$744Icelandair

Wed, Dec 2 - Thu, Dec 3

12:46 pm - 9:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 54m1 stop Denver Intl

12:05 pm - 11:13 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

43h 08m2 stops Zurich San Francisco

$766United Airlines

Tue, Jan 12 - Thu, Jan 14

7:00 am - 3:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 50m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

2:30 pm - 9:27 amLHR London Heathrow-SEA Seattle/Tacoma Intl

26h 57m1 stop Vancouver Intl

$766Lufthansa

Wed, Dec 2 - Thu, Dec 3

8:09 am - 9:10 amSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 01m2 stops Washington, D.C. Dulles Intl Newark

12:05 pm - 11:13 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

43h 08m2 stops Zurich San Francisco

$771United Airlines

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

Fri, Sep 11 - Fri, Sep 25

3:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

16h 05m1 stop Kastrup Copenhagen

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

15h 05m1 stop Kastrup Copenhagen

$803Scandinavian Airlines

Fri, Sep 11 - Fri, Sep 25

3:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

16h 05m1 stop Kastrup Copenhagen

1:55 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 50m2 stops Stockholm Arlanda Kastrup Copenhagen

$816Scandinavian Airlines

Sun, Sep 6 - Wed, Sep 16

7:10 pm - 3:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

11h 50m1 stop Dublin

7:40 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

17h 30m1 stop Dublin

$822Aer Lingus

Wed, Sep 9 - Wed, Sep 16

7:10 pm - 6:55 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 45m1 stop Dublin

9:50 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 20m1 stop Dublin

$822Aer Lingus

Wed, Sep 9 - Wed, Sep 23

7:10 pm - 6:55 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 45m1 stop Dublin

8:50 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

16h 20m1 stop Dublin

$843Multiple Airlines

Tue, Sep 8 - Tue, Sep 15

3:00 pm - 9:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

22h 20m3 stops Vancouver Intl Munich Franz Josef Strauss Stockholm Arlanda

9:05 pm - 6:32 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

29h 27m3 stops Stockholm Arlanda Zurich Vancouver Intl

$870Multiple Airlines

Mon, Sep 7 - Wed, Oct 7

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

$875Icelandair

Wed, Sep 9 - Wed, Sep 23

7:00 pm - 8:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 20m1 stop Reykjavik Keflavik Intl

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

31h 15m1 stop Reykjavik Keflavik Intl

$876Icelandair

Sun, Sep 6 - Tue, Sep 8

9:05 am - 7:25 amSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 20m1 stop San Francisco

7:25 am - 8:43 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 18m2 stops Munich Franz Josef Strauss San Francisco

$889United Airlines

Tue, Sep 8 - Thu, Sep 10

8:00 am - 9:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

29h 00m2 stops Toronto Pearson Intl Halifax Intl

11:05 am - 4:07 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

37h 02m2 stops Brussels Bruxelles-National Chicago O'Hare Intl

$890United Airlines

Recent direct flight deals from Washington to London

Tue, Dec 1 - Sun, Dec 6

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

$833British Airways

Tue, Dec 1 - Tue, Dec 8

1:30 pm - 7:00 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 30mnonstop

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

9h 55mnonstop

$833British Airways

Wed, Dec 2 - Thu, Dec 10

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

9h 55mnonstop

$833Multiple Airlines

Tue, Dec 1 - Tue, Dec 8

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 00mnonstop

$840Multiple Airlines

Mon, Mar 1 - Mon, Mar 8

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 05mnonstop

$851Alaska Airlines

Wed, Feb 3 - Wed, Mar 3

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 05mnonstop

$851Alaska Airlines

Mon, Oct 12 - Tue, Oct 27

1:30 pm - 6:45 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

9:25 am - 12:25 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 00mnonstop

$862Finnair

Mon, Oct 12 - Tue, Oct 27

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

9h 50mnonstop

12:20 pm - 3:54 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 34mnonstop

$877Virgin Atlantic

Mon, Oct 19 - Wed, Nov 4

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

9h 45mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$888Virgin Atlantic

Sun, Oct 4 - Thu, Oct 8

1:30 pm - 6:45 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

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

9h 45mnonstop

$895Finnair

Useful Info

Low season	January
High season	July
Cheapest flight	$291

Best time to beat the crowds with an average 22% drop in price.

Most popular time to fly with an average 26% increase in price.

Flight from Portland 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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$291 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

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