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>

$175 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

Wed, Oct 8 - Wed, Oct 15

3:45 pm - 8:20 pmSEA-LHR

20h 35m1 stop

1:05 pm - 8:40 pmLHR-SEA

15h 35m1 stop

$481Icelandair

Find Deal

Mon, Nov 10 - Thu, Dec 11

2:35 pm - 7:30 pmSEA-LHR

20h 55m1 stop

12:15 pm - 5:00 pmLHR-SEA

12h 45m1 stop

$482Icelandair

Find Deal

Tue, Aug 12 - Wed, Aug 27

1:55 pm - 11:45 amSEA-LHR

13h 50m1 stop

2:05 pm - 8:41 pmLHR-SEA

14h 36m1 stop

$508Lufthansa

Find Deal

Wed, Aug 27 - Wed, Sep 17

7:20 am - 6:30 amSEA-LHR

15h 10m1 stop

6:00 am - 6:36 pmLHR-SEA

20h 36m2 stops

$519

Find Deal

Tue, Aug 19 - Wed, Sep 3

1:30 pm - 6:50 amSEA-LHR

9h 20mnonstop

9:50 am - 11:35 amLHR-SEA

9h 45mnonstop

$527British Airways

Find Deal

Wed, Aug 27 - Wed, Sep 10

7:20 am - 10:00 amSEA-LHR

18h 40m1 stop

8:40 am - 7:31 pmLHR-SEA

18h 51m2 stops

$529Air Canada

Find Deal

Wed, Aug 6 - Wed, Aug 20

1:30 pm - 6:50 amSEA-LHR

9h 20mnonstop

9:50 am - 11:35 amLHR-SEA

9h 45mnonstop

$532British Airways

Find Deal

Tue, Aug 19 - Thu, Aug 28

7:20 am - 10:00 amSEA-LHR

18h 40m1 stop

6:50 am - 8:41 pmLHR-SEA

21h 51m2 stops

$536Air Canada

Find Deal

Sun, Aug 3 - Tue, Aug 19

2:55 pm - 2:40 pmPSC-LHR

15h 45m1 stop

2:45 pm - 11:59 pmLHR-PSC

17h 14m1 stop

$654

Find Deal

Fri, Aug 8 - Mon, Aug 18

1:37 pm - 9:40 amGEG-LHR

12h 03m1 stop

4:25 pm - 9:03 pmLHR-GEG

36h 38m2 stops

$920Lufthansa

Find Deal

Useful Info

Low season	February
High season	July
Cheapest flight	$175

Best time to beat the crowds with an average 14% drop in price.

Most popular time to fly with an average 21% 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.

Ilford

Deal

Southall

St. Albans

Folkestone

Chipping Campden

Barnet

Bishop's Stortford

Ascot

Ely

Enfield

Rye

Edgware

Weybridge

Alton

Woodstock

Christchurch

Dorking

Beaconsfield

Hatfield

Everything you need to know for your flight to Heathrow

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on your arrival and departure airports

London Heathrow Airport (LHR)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

LHR

$175 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

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