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 travellers 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 return 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>

£218 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

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

...and more

Travellers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

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

Cheapest return fare

£424

Overall average: £523

Icelandair

Wed 22/4Wed 29/4

SEA - LHR • 1 stop

Cheapest direct flights

£466

Typical prices: £457-£640

British Airways

Fri 23/1Fri 30/1

SEA - LHR • Direct

Start a new search

KAYAK searches hundreds 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 return 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 return flight deals from Washington to Heathrow

Wed, 22 Apr - Wed, 29 Apr

15:40 - 11:55

SEA

LHR

12h 15m1 stop

13:05 - 20:40

LHR

SEA

15h 35m1 stop

£424Icelandair

Fri, 17 Apr - Sun, 3 May

19:00 - 11:55

SEA

LHR

32h 55m1 stop

13:05 - 17:55

LHR

SEA

12h 50m1 stop

£424Icelandair

Thu, 19 Feb - Wed, 25 Feb

10:55 - 07:55

SEA

LHR

13h 00m1 stop

07:40 - 13:20

LHR

SEA

13h 40m1 stop

£429Multiple Airlines

Wed, 4 Mar - Mon, 9 Mar

12:38 - 12:00

GEG

LHR

15h 22m1 stop

07:40 - 21:03

LHR

GEG

20h 23m2 stops

£443Lufthansa

Wed, 4 Mar - Mon, 9 Mar

13:44 - 18:35

GEG

LHR

20h 51m2 stops

07:40 - 21:03

LHR

GEG

20h 23m2 stops

£449Lufthansa

Sun, 25 Jan - Sun, 1 Feb

06:53 - 11:50

GEG

LHR

20h 57m2 stops

07:40 - 19:03

LHR

GEG

19h 23m2 stops

£466Multiple Airlines

Wed, 25 Feb - Wed, 4 Mar

13:00 - 10:30

PSC

LHR

13h 30m1 stop

06:30 - 16:16

LHR

PSC

17h 46m2 stops

£467KLM

Tue, 17 Feb - Wed, 4 Mar

05:00 - 07:10

GEG

LHR

18h 10m2 stops

06:35 - 21:07

LHR

GEG

22h 32m2 stops

£469United Airlines

Mon, 9 Feb - Mon, 16 Feb

05:00 - 07:10

GEG

LHR

18h 10m2 stops

09:00 - 21:07

LHR

GEG

20h 07m2 stops

£469United Airlines

Wed, 8 Apr - Wed, 15 Apr

12:45 - 14:15

PSC

LHR

17h 30m1 stop

06:30 - 16:35

LHR

PSC

18h 05m2 stops

£478KLM

Useful Info

Low season	February
High season	July
Cheapest flight	£218

Best time to beat the crowds (7% less expensive on average)

Most popular time to fly (9% more expensive on average)

Flight from Portland to London Heathrow Airport

Verified travelerFlew with British Airways

SEA

LHR

Apr 2025

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

Verified travelerFlew with British Airways

SEA

LHR

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

SEA

LHR

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 travellers 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 return 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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Eastbourne

Hounslow

Luton

Southend-on-Sea

Swindon

Northampton

Slough

Winchester

Croydon

Stansted

Poole

Folkestone

Chichester

Maidstone

Salisbury

Colchester

Chelmsford

Crawley

Everything you need to know for your flight to Heathrow

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Information on your arrival and departure airports

London Heathrow Airport (LHR)

£218 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 return 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 - Cheap tickets from Washington to London Heathrow Airport

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 travellers 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 return 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.

Travelling 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 hire

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