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>

£194 CHEAP FLIGHTS from Washington to London

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Flight 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 - Wed, 8 Oct

15:45 - 22:30SEA-STN

22h 45m2 stops

08:15 - 20:40STN-SEA

20h 25m2 stops

£374

Find Deal

Fri, 24 Oct - Sun, 2 Nov

19:00 - 14:40SEA-LGW

11h 40m1 stop

11:55 - 17:00LGW-SEA

13h 05m1 stop

£374Icelandair

Find Deal

Wed, 4 Mar - Tue, 10 Mar

08:30 - 10:25SEA-LHR

17h 55m2 stops

16:40 - 14:20LHR-SEA

28h 40m1 stop

£374United Airlines

Find Deal

Tue, 30 Sep - Thu, 9 Oct

20:25 - 14:15SEA-LHR

9h 50mdirect

09:00 - 17:40LHR-SEA

16h 40m1 stop

£375Delta

Find Deal

Wed, 12 Nov - Tue, 18 Nov

16:48 - 10:30SEA-LHR

9h 42mdirect

06:20 - 11:25LHR-SEA

13h 05m1 stop

£375Delta

Find Deal

Wed, 1 Oct - Tue, 14 Oct

13:30 - 06:50SEA-LHR

9h 20mdirect

09:25 - 11:10LHR-SEA

9h 45mdirect

£377British Airways

Find Deal

Wed, 8 Oct - Tue, 14 Oct

07:15 - 06:30SEA-LHR

15h 15m1 stop

06:50 - 21:45LHR-SEA

22h 55m2 stops

£377Air Canada

Find Deal

Tue, 28 Oct - Tue, 4 Nov

05:50 - 07:10SEA-LHR

18h 20m2 stops

13:25 - 09:31LHR-SEA

28h 06m2 stops

£383Air Canada

Find Deal

Wed, 11 Mar - Wed, 18 Mar

06:31 - 07:55SEA-LHR

18h 24m1 stop

06:50 - 22:29LHR-SEA

22h 39m2 stops

£383United Airlines

Find Deal

Tue, 3 Mar - Wed, 15 Apr

07:48 - 06:50SEA-LHR

15h 02m1 stop

16:30 - 18:20LHR-SEA

9h 50mdirect

£392British Airways

Find Deal

Cheapest return fare

£374

Multi-carrier

Wed 1/10Wed 8/10

SEA - STN • 2 stops

Cheapest direct flights

£377

Typical prices: £460-672

British Airways

Wed 1/10Tue 14/10

SEA - LHR • Direct

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KAYAK searches hundreds of sites at once to find you the best travel deals.

We hope you love your trip to London!

Useful Info

Low season	January
High season	August
Cheapest flight	£194

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

Most popular time to fly and prices are also 22% lower on average.

Flight from Seattle 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

Hounslow

Southend-on-Sea

Slough

Winchester

Croydon

Stansted

Folkestone

Chichester

Maidstone

Colchester

Chelmsford

Crawley

Bedford

Richmond

Hastings

Watford

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 £2,666

Prem Econ Class flights to Londonfrom £1,294

Economy class flights to Londonfrom £361

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

£194 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

Everything you should know

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