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 return 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>

£320 CHEAP FLIGHTS from Washington to London

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Flights Deals

Cheap Flights from Washington to London

Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Washington to London 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 London

Wed, 1 Oct - Tue, 14 Oct

16:20 - 16:00SEA-LHR

15h 40m1 stop

19:50 - 14:00LHR-SEA

26h 10m2 stops

£320Scandinavian Airlines

Find Deal

Wed, 15 Oct - Mon, 20 Oct

16:20 - 17:40SEA-LHR

17h 20m1 stop

19:50 - 14:00LHR-SEA

50h 10m2 stops

£322Scandinavian Airlines

Find Deal

Mon, 6 Oct - Thu, 9 Oct

19:40 - 13:20PDX-LHR

33h 40m1 stop

06:30 - 18:46LHR-PDX

20h 16m2 stops

£375United Airlines

Find Deal

Mon, 17 Nov - Wed, 19 Nov

15:25 - 11:50PDX-LHR

12h 25m1 stop

08:55 - 22:33LHR-PDX

21h 38m2 stops

£381

Find Deal

Wed, 1 Oct - Tue, 14 Oct

13:30 - 06:50SEA-LHR

9h 20mdirect

09:25 - 11:10LHR-SEA

9h 45mdirect

£386British Airways

Find Deal

Wed, 8 Oct - Wed, 29 Oct

15:20 - 14:40PDX-LGW

15h 20m1 stop

11:55 - 18:00LGW-PDX

13h 05m1 stop

£403Icelandair

Find Deal

Wed, 1 Oct - Mon, 6 Oct

15:20 - 14:40PDX-LGW

15h 20m1 stop

15:40 - 17:55LGW-PDX

34h 15m1 stop

£404Icelandair

Find Deal

Fri, 15 Aug - Mon, 1 Sep

10:30 - 10:55PDX-LGW

16h 25m1 stop

10:25 - 09:25LGW-PDX

31h 00m1 stop

£408

Find Deal

Wed, 27 Aug - Fri, 12 Sep

07:44 - 06:25SEA-LHR

14h 41m1 stop

09:50 - 11:35LHR-SEA

9h 45mdirect

£415British Airways

Find Deal

Wed, 17 Sep - Wed, 8 Oct

07:15 - 06:30SEA-LHR

15h 15m1 stop

09:00 - 16:59LHR-SEA

15h 59m1 stop

£460United Airlines

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	£146

Best time to beat the crowds (5% less expensive on average)

Most popular time to fly (22% more expensive on average)

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-LHRApr 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 return 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.

Gatwick

Milton Keynes

Eastbourne

Luton

Southend-on-Sea

Winchester

Slough

Croydon

Stansted

Chichester

Folkestone

Maidstone

Colchester

Crawley

Chelmsford

Bedford

Hastings

Watford

Basingstoke

Royal Tunbridge Wells

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 £4,655

Business Class flights to Londonfrom £2,197

Prem Econ Class flights to Londonfrom £1,701

Economy class flights to Londonfrom £455

Not what you’re looking for? Find thousands of other hotels, flights, car hires and package deals with KAYAK.

£320 Find Cheap Flights from Washington to London

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

Cheap Flights from Washington to London

Recent return 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 - Cheap tickets from Washington to London

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

FAQs for booking flights from Washington to London

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 return 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.

Travelling 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 hire

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