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>

$260 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

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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 round-trip

$556

Typical prices: $685-$932

Icelandair

Wed 4/29Tue 5/12

SEA - LHR • 1 stop

Cheapest non-stop

$600

Typical prices: $622-$882

Virgin Atlantic

Thu 1/29Thu 2/12

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!

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, Apr 29 - Tue, May 12

7:00 pm - 8:20 pm

SEA

LHR

17h 20m1 stop

1:05 pm - 5:55 pm

LHR

SEA

12h 50m1 stop

$556Icelandair

Tue, Mar 3 - Thu, Mar 19

2:35 pm - 10:50 am

SEA

LHR

12h 15m1 stop

8:35 pm - 6:00 pm

LHR

SEA

28h 25m1 stop

$562Icelandair

Fri, May 1 - Tue, May 12

7:00 pm - 8:20 pm

SEA

LHR

17h 20m1 stop

1:05 pm - 5:55 pm

LHR

SEA

12h 50m1 stop

$563Icelandair

Mon, Jan 26 - Mon, Feb 2

8:10 am - 6:40 am

SEA

LHR

14h 30m1 stop

6:00 am - 8:57 pm

LHR

SEA

22h 57m2 stops

$566Austrian Airlines

Tue, Mar 17 - Thu, Mar 26

3:35 pm - 10:50 am

SEA

LHR

12h 15m1 stop

8:35 pm - 6:00 pm

LHR

SEA

28h 25m1 stop

$568Icelandair

Wed, Jan 28 - Wed, Feb 4

2:35 pm - 9:20 pm

SEA

LHR

22h 45m2 stops

6:40 am - 5:00 pm

LHR

SEA

18h 20m2 stops

$570Multiple Airlines

Tue, Jan 27 - Tue, Feb 3

10:58 am - 7:55 am

SEA

LHR

12h 57m1 stop

6:50 am - 6:14 pm

LHR

SEA

19h 24m2 stops

$571Brussels Airlines

Fri, Feb 13 - Fri, Feb 20

3:40 pm - 11:50 am

SEA

LHR

12h 10m1 stop

7:40 am - 1:20 pm

LHR

SEA

13h 40m1 stop

$573Lufthansa

Wed, Mar 4 - Wed, Mar 11

12:38 pm - 12:00 pm

GEG

LHR

15h 22m1 stop

6:35 am - 9:18 pm

LHR

GEG

21h 43m2 stops

$598Lufthansa

Wed, Mar 11 - Wed, Mar 18

6:00 am - 9:20 am

GEG

LHR

20h 20m2 stops

7:40 am - 9:03 pm

LHR

GEG

20h 23m2 stops

$621Multiple Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$260

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

Most popular time to fly with an average 18% increase in price.

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 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

Salisbury

Ilford

Crawley

Watford

Guildford

Kingston upon Thames

Eastbourne

Colchester

Swindon

St. Albans

Northampton

Ipswich

Bedford

Twickenham

Everything you need to know for your flight to Heathrow

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Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

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Information on your arrival and departure airports

London Heathrow Airport (LHR)

LHR

$260 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