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.

$276 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

Tue, Oct 6 - Wed, Oct 14

8:00 am - 7:55 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

27h 55m3 stops Toronto Pearson Intl Munich Franz Josef Strauss Stockholm Arlanda

6:05 pm - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

30h 54m2 stops Stockholm Arlanda Munich Franz Josef Strauss

$653Multiple Airlines

Fri, Oct 2 - Fri, Oct 9

3:55 pm - 4:25 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

16h 30m2 stops Kastrup Copenhagen Stockholm Arlanda

5:10 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 35m3 stops Amsterdam Schiphol Stockholm Arlanda Kastrup Copenhagen

$656Multiple Airlines

Sat, Oct 3 - Sat, Oct 10

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

17h 45m1 stop Kastrup Copenhagen

2:20 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 25m1 stop Kastrup Copenhagen

$659Scandinavian Airlines

Sat, Oct 3 - 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

39h 05m2 stops Stockholm Arlanda Kastrup Copenhagen

$659Scandinavian Airlines

Fri, Oct 9 - Mon, Oct 19

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

32h 55m1 stop Reykjavik Keflavik Intl

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

31h 15m1 stop Reykjavik Keflavik Intl

$702Icelandair

Sun, Feb 7 - Sun, Feb 21

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

$711Icelandair

Mon, Oct 19 - Fri, Oct 23

6:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

13h 05m1 stop Dublin

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

17h 30m1 stop Dublin

$743Aer Lingus

Mon, Dec 28 - Wed, Dec 30

3:15 pm - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 35m1 stop Vancouver Intl

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

13h 20m1 stop Munich Franz Josef Strauss

$766Lufthansa

Sun, Oct 18 - Tue, Oct 20

2:10 pm - 4:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 30m1 stop Frankfurt am Main

7:25 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

17h 34m1 stop Munich Franz Josef Strauss

$783Lufthansa

Sun, Oct 11 - Sat, Oct 24

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

11h 50m1 stop Dublin

12:00 pm - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 10m1 stop Dublin

$889Aer Lingus

Recent last minute flight deals from Washington to London

Tue, Sep 1 - Mon, Sep 7

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

$857Icelandair

Tue, Sep 1 - Thu, Sep 10

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

$857Icelandair

Tue, Sep 1 - Thu, Sep 10

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

11h 50m1 stop Dublin

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

15h 20m1 stop Dublin

$869Aer Lingus

Tue, Sep 1 - Fri, Sep 4

5:35 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

38h 25m2 stops Chicago O'Hare Intl Kastrup Copenhagen

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

39h 05m2 stops Stockholm Arlanda Kastrup Copenhagen

$892Scandinavian Airlines

Tue, Sep 1 - Thu, Sep 17

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

11h 50m1 stop Dublin

12:00 pm - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 10m1 stop Dublin

$910Aer Lingus

Tue, Sep 1 - Thu, Oct 1

7:38 am - 5:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

26h 02m2 stops Boston Logan Intl Kastrup Copenhagen

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

27h 05m1 stop Kastrup Copenhagen

$936Scandinavian Airlines

Tue, Sep 1 - Thu, Sep 10

11:25 pm - 9:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

26h 10m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Oslo Gardermoen

6:40 am - 5:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

19h 15m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$949Multiple Airlines

Sun, Aug 30 - Wed, Sep 2

11:59 pm - 11:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

27h 36m1 stop Houston George Bush Intcntl

8:40 am - 6:32 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

17h 52m2 stops Zurich Vancouver Intl

$964Multiple Airlines

Tue, Sep 1 - Thu, Sep 17

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

9h 45mnonstop

8:40 am - 4:35 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 55m1 stop Amsterdam Schiphol

$1,004KLM

Tue, Sep 1 - Thu, Sep 10

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

9h 45mnonstop

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

10h 20mnonstop

$1,033KLM

Recent direct flight deals from Washington to London

Mon, Nov 23 - Tue, Dec 1

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, 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

$837British Airways

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

$837Multiple Airlines

Wed, Nov 25 - Tue, Dec 1

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

$837Multiple Airlines

Wed, Dec 9 - Sat, Dec 26

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

$853Alaska Airlines

Wed, Dec 9 - Sun, Dec 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

$853Alaska Airlines

Sun, Oct 18 - Tue, Nov 3

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

9h 15mnonstop

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

10h 00mnonstop

$866Finnair

Mon, Oct 19 - Wed, Nov 4

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

9h 25mnonstop

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

9h 55mnonstop

$869Finnair

Wed, Oct 7 - Wed, Oct 14

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

9h 45mnonstop

5:45 pm - 8:14 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 29mnonstop

$869Virgin Atlantic

Mon, Oct 19 - Tue, Nov 3

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

9h 50mnonstop

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

10h 30mnonstop

$913Virgin Atlantic

Useful Info

Low season	January
High season	July
Cheapest flight	$276

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

Most popular time to fly with an average 27% 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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$276 Find Cheap Flights from Washington to London Heathrow Airport - Compare and Save

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Recent round-trip flight deals from Washington to London

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