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.

$262 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, Sep 25 - Fri, Oct 2

3:55 pm - 3:25 pmSEA Seattle/Tacoma Intl-STN London Stansted

15h 30m1 stop Kastrup Copenhagen

6:20 am - 1:45 pmSTN London Stansted-SEA Seattle/Tacoma Intl

15h 25m1 stop Kastrup Copenhagen

$648Multiple Airlines

Fri, Oct 2 - Fri, Oct 9

3:55 pm - 12:40 pmSEA Seattle/Tacoma Intl-STN London Stansted

12h 45m1 stop Kastrup Copenhagen

6:20 am - 1:45 pmSTN London Stansted-SEA Seattle/Tacoma Intl

15h 25m1 stop Kastrup Copenhagen

$651Multiple Airlines

Sat, Oct 3 - Sat, Oct 10

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 05m2 stops Stockholm Arlanda Kastrup Copenhagen

$651Scandinavian Airlines

Fri, Oct 2 - Sun, Oct 4

10:55 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 05m2 stops San Francisco Kastrup Copenhagen

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

15h 05m2 stops Stockholm Arlanda Kastrup Copenhagen

$656Scandinavian Airlines

Sun, Dec 6 - Sun, Dec 13

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

$703Icelandair

Fri, Oct 2 - Wed, Nov 11

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

32h 55m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$707Icelandair

Mon, Feb 1 - Thu, Feb 4

3:15 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 05m2 stops Vancouver Intl Calgary

8:45 am - 9:27 amLHR London Heathrow-SEA Seattle/Tacoma Intl

32h 42m2 stops Munich Franz Josef Strauss Vancouver Intl

$722Lufthansa

Mon, Feb 15 - Wed, Feb 17

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

$731Lufthansa

Wed, Dec 2 - Fri, Dec 4

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

$744United Airlines

Mon, Nov 30 - Wed, Dec 2

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

$776United Airlines

Recent last minute flight deals from Washington to London

Tue, Aug 25 - Tue, Sep 1

7:00 pm - 9:10 amSEA Seattle/Tacoma Intl-LGW London Gatwick

30h 10m3 stops Reykjavik Keflavik Intl Stockholm Arlanda Kastrup Copenhagen

7:05 pm - 8:40 pmLGW London Gatwick-SEA Seattle/Tacoma Intl

33h 35m3 stops Kastrup Copenhagen Stockholm Arlanda Reykjavik Keflavik Intl

$855Multiple Airlines

Mon, Aug 24 - Sun, Aug 30

7:00 pm - 8:40 amSEA Seattle/Tacoma Intl-LGW London Gatwick

29h 40m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Oslo Gardermoen

8:45 pm - 11:45 amLGW London Gatwick-SEA Seattle/Tacoma Intl

23h 00m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$857Multiple Airlines

Sun, Aug 23 - Tue, Aug 25

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

14h 15m1 stop Munich Franz Josef Strauss

6:30 am - 11:55 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 25m1 stop Frankfurt am Main

$890Lufthansa

Sun, Aug 23 - Tue, Aug 25

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

14h 15m1 stop Munich Franz Josef Strauss

6:30 am - 11:55 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 25m1 stop Frankfurt am Main

$898Lufthansa

Mon, Aug 24 - 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

$917KLM

Sun, Aug 23 - Tue, Aug 25

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

$917KLM

Wed, Aug 26 - Wed, Sep 23

7:10 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 50m1 stop Dublin

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

16h 20m1 stop Dublin

$918Aer Lingus

Mon, Aug 24 - Sun, Aug 30

7:20 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 40m2 stops San Francisco Kastrup Copenhagen

10:20 am - 11:47 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 27m2 stops Kastrup Copenhagen Los Angeles

$952Scandinavian Airlines

Tue, Aug 25 - Mon, Sep 14

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

24h 22m2 stops Boston Logan Intl Kastrup Copenhagen

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

27h 05m1 stop Kastrup Copenhagen

$956Scandinavian Airlines

Mon, Aug 24 - Tue, Sep 8

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

11h 50m1 stop Dublin

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

16h 20m1 stop Dublin

$958Aer Lingus

Recent direct flight deals from Washington to London

Tue, Dec 1 - Wed, Dec 9

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

$832British Airways

Wed, Nov 18 - Sun, Nov 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

$832Multiple Airlines

Mon, Nov 30 - Mon, Dec 7

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

$832Multiple Airlines

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 9 - Sat, Mar 20

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

9h 25mnonstop

2:45 pm - 5:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 05mnonstop

$849Alaska Airlines

Tue, Dec 1 - 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

Wed, Dec 9 - Wed, Dec 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

$882Delta

Wed, Dec 9 - Wed, Dec 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

$883Delta

Tue, Nov 24 - Tue, Dec 8

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:54 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 34mnonstop

$883KLM

Tue, Dec 15 - Wed, Dec 23

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:54 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 34mnonstop

$915KLM

Useful Info

Low season	January
High season	April
Cheapest flight	$262

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

Most popular time to fly and prices are also 16% 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

Bedford

Watford

Guildford

Colchester

Kingston upon Thames

Ipswich

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 $5,127

Business Class flights to Londonfrom $3,762

Premium Economy Class flights to Londonfrom $1,736

Economy Class flights to Londonfrom $747

$262 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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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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