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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$265 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

LHR

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Cheap Flights from Washington to Heathrow

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

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 Heathrow

Sun, Sep 28 - Tue, Oct 14

5:35 pm - 11:20 amSEA-LHR

9h 45mnonstop

3:25 pm - 11:15 amLHR-SEA

27h 50m1 stop

$508Virgin Atlantic

Find Deal

Wed, Nov 12 - Wed, Nov 19

4:48 pm - 10:30 amSEA-LHR

9h 42mnonstop

6:20 am - 1:20 pmLHR-SEA

15h 00m1 stop

$509Delta

Find Deal

Wed, Nov 12 - Thu, Nov 20

4:48 pm - 10:30 amSEA-LHR

9h 42mnonstop

6:20 am - 11:25 amLHR-SEA

13h 05m1 stop

$510Air France

Find Deal

Wed, Oct 1 - Tue, Oct 14

1:30 pm - 6:50 amSEA-LHR

9h 20mnonstop

9:25 am - 11:10 amLHR-SEA

9h 45mnonstop

$512British Airways

Find Deal

Mon, Oct 6 - Wed, Oct 22

1:30 pm - 6:50 amSEA-LHR

9h 20mnonstop

9:50 am - 11:35 amLHR-SEA

9h 45mnonstop

$513British Airways

Find Deal

Wed, Oct 15 - Wed, Oct 22

8:25 pm - 2:15 pmSEA-LHR

9h 50mnonstop

6:15 am - 11:15 amLHR-SEA

13h 00m1 stop

$514Air France

Find Deal

Thu, Nov 6 - Fri, Nov 21

2:35 pm - 10:50 amSEA-LHR

12h 15m1 stop

12:15 pm - 5:00 pmLHR-SEA

12h 45m1 stop

$515Icelandair

Find Deal

Thu, Jan 8 - Mon, Jan 12

2:35 pm - 10:50 amSEA-LHR

12h 15m1 stop

12:15 pm - 5:00 pmLHR-SEA

12h 45m1 stop

$516Icelandair

Find Deal

Tue, Jan 6 - Fri, Jan 16

8:00 pm - 11:50 amSEA-LHR

31h 50m1 stop

2:30 pm - 7:16 pmLHR-SEA

12h 46m1 stop

$519Air Canada

Find Deal

Tue, Oct 14 - Thu, Oct 23

7:15 pm - 1:20 pmSEA-LHR

34h 05m1 stop

10:15 am - 6:36 pmLHR-SEA

16h 21m2 stops

$520Air Canada

Find Deal

Cheapest round-trip

$508

Overall average: $702

Virgin Atlantic

Sun 9/28Tue 10/14

SEA - LHR • Non-stop

Cheapest non-stop

$510

Typical prices: $634-779

Finnair

Mon 3/9Wed 3/18

SEA - LHR • Non-stop

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KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Heathrow!

Useful Info

Low season	February
High season	July
Cheapest flight	$265

Best time to beat the crowds with an average 13% drop in price.

Most popular time to fly with an average 17% increase in price.

Flight from Seattle to London Heathrow Airport

Verified travelerFlew with British AirwaysSEA-LHRApr 2025

Make sure you have plenty of time between flights if you are delayed.

Verified travelerFlew with British AirwaysSEA-LHRApr 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.

Hounslow

Wembley

Slough

Hayes

Richmond

Luton

Salisbury

Ilford

Watford

Crawley

Guildford

Eastbourne

Northampton

Kingston upon Thames

Swindon

Harrow

Hastings

St. Albans

Moreton-in-Marsh

Barnet

Everything you need to know for your flight to Heathrow

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Complete your trip

Direct Flights

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Origins

Other airports

Return flight deals

Information on your arrival and departure airports

London Heathrow Airport (LHR)

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$265 Find Cheap Flights from Washington to London Heathrow Airport

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

Cheap Flights from Washington to Heathrow

Recent round-trip flight deals from Washington to Heathrow

Recent one-way flight deals from Washington to Heathrow

Recent last minute flight deals from Washington to Heathrow

Recent direct flight deals from Washington to Heathrow

Everything you should know

Good to know

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

FAQs for booking Washington to London Heathrow Airport flights

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.

Traveling to a place near Heathrow?

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

Cabin class types available on flights to Heathrow

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

Find direct flights for Heathrow

Flights to other popular destinations

Flights from domestic origins to Washington

Choose which airport to fly into in London

Find deals for your return flight