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>

$271 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

LHR

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

...and more

Travelers love KAYAK

41.299.237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$584

Overall average: $729

Delta

Wed 1/14Wed 1/21

SEA - LHR • Non-stop

Cheapest non-stop

$584

Typical prices: $848-$1,446

Delta

Mon 12/8Tue 12/23

SEA - LHR • Non-stop

Start a new search

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

We hope you love your trip to Heathrow!

Flight Deals

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, Jan 14 - Wed, Jan 21

4:45 pm - 10:30 amSEA-LHR

9h 45mnonstop

6:20 am - 1:25 pmLHR-SEA

15h 05m1 stop

$584Delta

Find Deal

Wed, Mar 11 - Fri, Mar 20

12:35 pm - 12:00 pmSEA-LHR

16h 25m1 stop

1:25 pm - 10:53 pmLHR-SEA

40h 28m2 stops

$585United Airlines

Find Deal

Fri, Jan 16 - Fri, Jan 23

11:25 am - 10:00 amSEA-LHR

14h 35m1 stop

12:20 pm - 2:49 pmLHR-SEA

10h 29mnonstop

$586Virgin Atlantic

Find Deal

Mon, Mar 9 - Mon, Mar 16

10:05 am - 10:10 amSEA-LHR

17h 05m2 stops

7:30 pm - 1:10 pmLHR-SEA

24h 40m1 stop

$587Lufthansa

Find Deal

Mon, Apr 27 - Tue, May 5

7:00 pm - 1:20 pmPDX-LHR

34h 20m1 stop

8:45 am - 6:46 pmLHR-PDX

18h 01m2 stops

$589Air Canada

Find Deal

Mon, Apr 20 - Thu, May 7

10:10 am - 1:20 pmSEA-LHR

19h 10m1 stop

8:45 am - 6:36 pmLHR-SEA

17h 51m2 stops

$589Multiple Airlines

Find Deal

Fri, Jan 16 - Sat, Jan 24

10:05 am - 10:10 amSEA-LHR

16h 05m2 stops

6:30 am - 12:10 pmLHR-SEA

13h 40m1 stop

$591Lufthansa

Find Deal

Wed, Apr 1 - Thu, Apr 9

3:15 pm - 1:20 pmPDX-LHR

14h 05m1 stop

2:10 pm - 6:30 pmLHR-PDX

12h 20m1 stop

$591Multiple Airlines

Find Deal

Mon, Apr 27 - Tue, May 5

9:50 am - 10:00 amPDX-LHR

16h 10m2 stops

8:45 am - 6:46 pmLHR-PDX

18h 01m2 stops

$592Air Canada

Find Deal

Wed, Feb 25 - Wed, Mar 11

6:30 am - 6:55 amGEG-LHR

16h 25m2 stops

10:45 am - 9:04 pmLHR-GEG

17h 19m2 stops

$609Virgin Atlantic

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	$271

Best time to beat the crowds with an average 11% drop in price.

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

Flight from Portland 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-LHRFeb 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 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

Slough

Wembley

Hayes

Richmond

Luton

Ilford

Salisbury

Crawley

Watford

Guildford

Eastbourne

Kingston upon Thames

Swindon

Colchester

St. Albans

Ipswich

Twickenham

Northampton

Bedford

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)

LHR

$271 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

Everything you should know

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