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>

$296 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

LHR

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Cheap Flights from Washington to Heathrow

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

Tue, Nov 10 - Thu, Nov 12

11:30 am - 12:00 pm

GEG

LHR

16h 30m

1 stop

6:35 am - 9:09 pm

LHR

GEG

22h 34m

2 stops

$750United Airlines

Wed, Sep 9 - Wed, Oct 7

3:54 pm - 12:35 pm

GEG

LHR

12h 41m

1 stop

8:40 am - 10:30 am

LHR

GEG

33h 50m

2 stops

$860United Airlines

Wed, Sep 9 - Wed, Oct 7

3:54 pm - 12:35 pm

GEG

LHR

12h 41m

1 stop

8:40 am - 10:30 am

LHR

GEG

33h 50m

2 stops

$861United Airlines

Wed, Oct 14 - Wed, Oct 28

6:00 am - 9:00 am

GEG

LHR

19h 00m

1 stop

7:40 pm - 11:58 am

LHR

GEG

23h 18m

2 stops

$874Iberia

Mon, Oct 5 - Tue, Oct 13

12:35 pm - 12:10 pm

PSC

LHR

15h 35m

1 stop

6:30 am - 5:04 pm

LHR

PSC

18h 34m

2 stops

$877Delta

Wed, Sep 23 - Wed, Oct 14

10:05 am - 10:00 am

GEG

LHR

15h 55m

1 stop

8:40 am - 7:27 pm

LHR

GEG

18h 47m

2 stops

$877Delta

Sun, Nov 1 - Thu, Nov 12

7:02 am - 11:50 am

GEG

LHR

20h 48m

2 stops

6:35 am - 9:09 pm

LHR

GEG

22h 34m

2 stops

$878Multiple Airlines

Thu, Jul 23 - Mon, Aug 3

3:40 pm - 8:20 pm

SEA

LHR

20h 40m

1 stop

9:25 pm - 11:45 am

LHR

SEA

22h 20m

1 stop

$898Icelandair

Sat, Jul 4 - Wed, Jul 15

11:25 pm - 8:20 pm

SEA

LHR

12h 55m

1 stop

1:05 pm - 8:40 pm

LHR

SEA

15h 35m

1 stop

$900Icelandair

Wed, Sep 2 - Wed, Sep 16

10:45 am - 11:50 am

SEA

LHR

17h 05m

2 stops

8:40 am - 6:32 pm

LHR

SEA

17h 52m

2 stops

$903Multiple Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$296

Best time to beat the crowds with an average 16% drop in price.

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

Flight from Portland to London Heathrow Airport

MichaelFlew with Delta

SEA

LHR

May 2026

We like Delta, Alaska and American. Be prepared for a bit of a trek from your arrival gate to Customs and outside services. Heathrow doesn't rank high on my list of major airports.

Verified travelerFlew with American Airlines

SEA

LHR

Apr 2026

Heathrow is too gigantic to have less than 2 hours of layover time.

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

Hayes

Wembley

Richmond

Luton

Salisbury

Crawley

Ilford

Watford

Eastbourne

Swindon

Bedford

Colchester

Guildford

Ipswich

Northampton

Twickenham

Kingston upon Thames

St. Albans

Everything you need to know for your flight to Heathrow

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London Heathrow Airport (LHR)

LHR

$296 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