How does KAYAK find such low prices on flights from Washington to London?

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. 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?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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?

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 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?

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 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>

$253 CHEAP FLIGHTS from Washington to London

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

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Flight Deals

Cheap Flights from Washington to London

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 London

Mon, Nov 9 - Thu, Nov 12

4:03 pm - 9:40 am

GEG

LHR

33h 37m

1 stop

9:00 am - 9:01 pm

LHR

GEG

20h 01m

2 stops

$757United Airlines

Sun, Sep 20 - Tue, Sep 22

5:00 am - 9:40 am

GEG

LHR

20h 40m

1 stop

7:30 am - 9:14 pm

LHR

GEG

21h 44m

2 stops

$759United Airlines

Sun, Sep 20 - Tue, Sep 22

5:00 am - 9:00 am

GEG

LHR

20h 00m

2 stops

7:30 am - 9:14 pm

LHR

GEG

21h 44m

2 stops

$763United Airlines

Sun, Aug 16 - Tue, Aug 25

3:55 pm - 6:50 pm

SEA

LHR

18h 55m

2 stops

7:05 am - 1:45 pm

LHR

SEA

14h 40m

2 stops

$848Scandinavian Airlines

Sat, Nov 7 - Wed, Nov 11

2:35 pm - 10:55 am

SEA

LGW

12h 20m

1 stop

11:55 am - 5:00 pm

LGW

SEA

13h 05m

1 stop

$849Icelandair

Tue, Nov 3 - Tue, Nov 10

4:48 pm - 10:30 am

SEA

LHR

9h 42mnonstop

6:30 am - 11:47 am

LHR

SEA

13h 17m

1 stop

$849KLM

Wed, Jul 22 - Wed, Aug 12

3:40 pm - 11:20 pm

SEA

STN

23h 40m

2 stops

10:45 pm - 9:07 pm

STN

SEA

30h 22m

3 stops

$850Multiple Airlines

Tue, Jul 14 - Sun, Jul 26

3:40 pm - 7:35 pm

SEA

STN

19h 55m

2 stops

7:45 pm - 10:07 am

STN

SEA

46h 22m

3 stops

$851Multiple Airlines

Thu, Sep 17 - Sat, Sep 26

7:00 pm - 2:40 pm

SEA

LGW

11h 40m

1 stop

3:40 pm - 8:40 pm

LGW

SEA

13h 00m

1 stop

$854Icelandair

Fri, Aug 14 - Tue, Aug 25

3:55 pm - 9:35 am

SEA

LHR

33h 40m

2 stops

6:40 am - 1:45 pm

LHR

SEA

15h 05m

1 stop

$856Scandinavian Airlines

Useful Info

Low season	January
High season	August
Cheapest flight	$253

Best time to beat the crowds but there is an average 2% increase in price.

Flight from Portland to London Stansted 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?
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.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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?
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 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?
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 from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Hounslow

Hayes

Slough

Richmond

Wembley

Luton

Crawley

Ilford

Eastbourne

Watford

Bedford

Colchester

Guildford

Twickenham

Ipswich

Kingston upon Thames

St. Albans

Maidenhead

Newbury

Harrow

Everything you need to know for your flight to London

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Cabin class types available on flights to Washington

First Class flights to Londonfrom $5,751

Business Class flights to Londonfrom $3,064

Premium Economy Class flights to Londonfrom $1,642

Economy Class flights to Londonfrom $832

$253 Find Cheap Flights from Washington to London - Compare and Save

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

Cheap Flights from Washington to London

Recent round-trip flight deals from Washington to London

Recent one-way flight deals from Washington to London

Recent last minute flight deals from Washington to London

Recent direct flight deals from Washington to London

Good to know

Flights from Washington to London: the best tips from KAYAK users

FAQs for booking flights from Washington to London

Traveling to a place near London?

Everything you need to know for your flight to London

Cabin class types available on flights to Washington

Complete your trip to London with a hotel stay or car rental

Find direct flights for London

Flights to other popular destinations

Flights from domestic origins to London

Choose which airport to fly into in London

Find deals for your return flight