How does KAYAK find such low prices on flights from Washington to London?

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.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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?

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 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?

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 from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$255 CHEAP FLIGHTS from Washington to London

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Flight Deals

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, Oct 16 - Sat, Nov 14

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

$626Icelandair

Tue, Sep 22 - Tue, Oct 6

3:55 pm - 2:35 pmSEA Seattle/Tacoma Intl-STN London Stansted

14h 40m1 stop Kastrup Copenhagen

7:10 am - 1:45 pmSTN London Stansted-SEA Seattle/Tacoma Intl

14h 35m1 stop Kastrup Copenhagen

$630Multiple Airlines

Sun, Oct 11 - Sun, Nov 8

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

$632Icelandair

Sun, Sep 27 - Tue, Oct 13

8:00 am - 7:55 pmSEA Seattle/Tacoma Intl-STN London Stansted

27h 55m3 stops Toronto Pearson Intl Brussels Bruxelles-National Oslo Gardermoen

7:05 am - 4:59 pmSTN London Stansted-SEA Seattle/Tacoma Intl

17h 54m2 stops Oslo Gardermoen Munich Franz Josef Strauss

$632Multiple Airlines

Sat, Sep 19 - Mon, Sep 21

3:55 pm - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 45m1 stop Kastrup Copenhagen

9:05 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 40m2 stops Stockholm Arlanda Kastrup Copenhagen

$634Scandinavian Airlines

Tue, Sep 15 - Fri, Sep 18

11:08 pm - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

35h 22m2 stops Boston Logan Intl Kastrup Copenhagen

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

27h 40m2 stops Stockholm Arlanda Kastrup Copenhagen

$644Scandinavian Airlines

Mon, Oct 12 - Tue, Nov 10

8:20 pm - 1:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 00mnonstop

$724British Airways

Wed, Oct 14 - Thu, Nov 12

8:20 pm - 1:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 00mnonstop

$724British Airways

Sat, Nov 14 - Tue, Nov 17

7:05 pm - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 45m1 stop Vancouver Intl

6:50 am - 10:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 09m2 stops Brussels Bruxelles-National Chicago O'Hare Intl

$732United Airlines

Sat, Nov 14 - Tue, Nov 17

8:30 am - 7:10 amSEA Seattle/Tacoma Intl-LHR London Heathrow

38h 40m3 stops Denver Intl Newark Montreal Pierre Elliott Trudeau Intl

6:50 am - 8:56 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 06m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

$740United Airlines

Recent last minute flight deals from Washington to London

Tue, Aug 11 - Wed, Aug 26

11:25 pm - 8:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 55m1 stop Reykjavik Keflavik Intl

9:25 pm - 11:45 amLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 20m1 stop Reykjavik Keflavik Intl

$831Icelandair

Tue, Aug 11 - Tue, Aug 18

11:25 pm - 8:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 55m1 stop Reykjavik Keflavik Intl

9:25 pm - 11:45 amLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 20m1 stop Reykjavik Keflavik Intl

$831Icelandair

Tue, Aug 11 - Tue, Aug 25

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

27h 00m3 stops Vancouver Intl Zurich Kastrup Copenhagen

6:40 am - 9:07 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 27m2 stops Kastrup Copenhagen Toronto Pearson Intl

$841Multiple Airlines

Mon, Aug 10 - Thu, Sep 10

6:10 pm - 6:50 pmSEA Seattle/Tacoma Intl-LGW London Gatwick

16h 40m1 stop Frankfurt am Main

10:20 am - 4:00 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

13h 40m1 stop Frankfurt am Main

$874Condor

Tue, Aug 11 - Wed, Aug 26

6:50 pm - 5:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 15m1 stop Munich Franz Josef Strauss

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

14h 09m1 stop Munich Franz Josef Strauss

$928Lufthansa

Mon, Aug 10 - Wed, Aug 26

2:10 pm - 12:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 30m1 stop Frankfurt am Main

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

14h 09m1 stop Munich Franz Josef Strauss

$960Lufthansa

Tue, Aug 11 - Tue, Aug 18

7:38 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 42m2 stops Boston Logan Intl Kastrup Copenhagen

6:40 am - 11:19 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 39m2 stops Kastrup Copenhagen San Francisco

$981Scandinavian Airlines

Mon, Aug 10 - Sat, Aug 22

7:38 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 22m2 stops Boston Logan Intl Kastrup Copenhagen

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

15h 05m1 stop Kastrup Copenhagen

$993Scandinavian Airlines

Sun, Aug 9 - Wed, Aug 26

6:20 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

11:45 am - 4:27 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 42m1 stop Amsterdam Schiphol

$1,000KLM

Mon, Aug 10 - Wed, Aug 26

9:45 pm - 3:35 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

11:45 am - 4:27 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 42m1 stop Amsterdam Schiphol

$1,001KLM

Recent direct flight deals from Washington to London

Mon, Oct 12 - Tue, Nov 10

8:20 pm - 1:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 00mnonstop

$724British Airways

Sun, Oct 11 - Thu, Nov 12

8:20 pm - 1:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 00mnonstop

$724British Airways

Wed, Nov 25 - Tue, Dec 8

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

$829Multiple Airlines

Sun, Nov 29 - Wed, Dec 9

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

$829Multiple Airlines

Tue, Dec 1 - Sat, Dec 12

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

$847Alaska Airlines

Tue, Nov 3 - Fri, Nov 27

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

$862Alaska Airlines

Wed, Sep 16 - Wed, Sep 23

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

9h 45mnonstop

5:45 pm - 8:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 25mnonstop

$869Virgin Atlantic

Mon, Nov 16 - Thu, Nov 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

$880American Airlines

Sun, Sep 6 - Tue, Sep 22

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

9h 50mnonstop

11:40 am - 2:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$892Virgin Atlantic

Wed, Jan 20 - Wed, Jan 27

5:45 pm - 11:20 amPDX Portland-LHR London Heathrow

9h 35mnonstop

1:35 pm - 3:50 pmLHR London Heathrow-PDX Portland

10h 15mnonstop

$909American Airlines

Useful Info

Low season	January
High season	April
Cheapest flight	$255

Best time to beat the crowds but there is an average 1% increase in price.

Most popular time to fly and prices are also 15% lower on average.

Flight from Portland to London Stansted 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?
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.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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?
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 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?
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 from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Hounslow

Hayes

Slough

Richmond

Wembley

Luton

Eastbourne

Ilford

Crawley

Watford

Bedford

Colchester

Ipswich

Guildford

Kingston upon Thames

Twickenham

St. Albans

Harrow

Newbury

Maidenhead

Everything you need to know for your flight to London

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Cabin class types available on flights to Washington

First Class flights to Londonfrom $5,777

Business Class flights to Londonfrom $3,762

Premium Economy Class flights to Londonfrom $1,652

Economy Class flights to Londonfrom $826

$255 Find Cheap Flights from Washington to London - 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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High season

Cheapest flight

Flights from Washington to London: the best tips from KAYAK users

FAQs for booking flights from Washington to London

Traveling to a place near London?

Everything you need to know for your flight to London

Cabin class types available on flights to Washington

Complete your trip to London with a hotel stay or car rental

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Choose which airport to fly into in London

Find deals for your return flight