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>

£201 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

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

Sun, 15 Mar - Wed, 25 Mar

15:35 - 19:30SEA-LHR

20h 55m1 stop

20:35 - 18:00LHR-SEA

28h 25m1 stop

£393Icelandair

Find Deal

Sun, 15 Feb - Sun, 1 Mar

14:35 - 10:50SEA-LHR

12h 15m1 stop

12:15 - 17:00LHR-SEA

12h 45m1 stop

£394Icelandair

Find Deal

Wed, 12 Nov - Wed, 19 Nov

14:35 - 18:55SEA-LGW

20h 20m2 stops

08:50 - 17:00LGW-SEA

16h 10m2 stops

£395Multiple Airlines

Find Deal

Wed, 12 Nov - Wed, 19 Nov

14:35 - 17:05SEA-LTN

18h 30m2 stops

06:50 - 17:00LTN-SEA

18h 10m2 stops

£397Multiple Airlines

Find Deal

Mon, 1 Dec - Wed, 17 Dec

20:05 - 21:05SEA-LHR

17h 00m1 stop

08:50 - 18:20LHR-SEA

17h 30m1 stop

£416Aer Lingus

Find Deal

Mon, 24 Nov - Fri, 5 Dec

20:05 - 15:35SEA-LHR

11h 30m1 stop

12:10 - 18:20LHR-SEA

14h 10m1 stop

£423Aer Lingus

Find Deal

Wed, 12 Nov - Fri, 21 Nov

15:10 - 13:00SEA-LHR

13h 50m1 stop

06:35 - 13:20LHR-SEA

14h 45m1 stop

£427Lufthansa

Find Deal

Thu, 4 Dec - Sun, 14 Dec

19:20 - 12:50SEA-LHR

9h 30mdirect

12:20 - 14:58LHR-SEA

10h 38mdirect

£430Virgin Atlantic

Find Deal

Sun, 23 Nov - Tue, 16 Dec

15:40 - 11:50SEA-LHR

12h 10m1 stop

06:30 - 12:10LHR-SEA

13h 40m1 stop

£433Lufthansa

Find Deal

Wed, 14 Jan - Thu, 29 Jan

06:00 - 07:05PDX-LHR

17h 05m1 stop

11:05 - 17:35LHR-PDX

14h 30m1 stop

£433Virgin Atlantic

Find Deal

Cheapest return fare

£393

Typical prices: £467-£600

Icelandair

Sun 15/3Wed 25/3

SEA - LHR • 1 stop

Cheapest direct flights

£430

Typical prices: £613-£1,106

Virgin Atlantic

Thu 4/12Sun 14/12

SEA - LHR • Direct

Start a new search

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	£201

Best time to beat the crowds (0% less expensive on average)

Most popular time to fly and prices are also 19% lower on average.

Flight from Portland to London Gatwick 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

Croydon

Winchester

Stansted

Folkestone

Chichester

Maidstone

Colchester

Chelmsford

Crawley

Bedford

Richmond

Watford

Hastings

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 £4,801

Business Class flights to Londonfrom £2,749

Prem Econ Class flights to Londonfrom £1,335

Economy class flights to Londonfrom £493

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

£201 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