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>

£207 CHEAP FLIGHTS from Washington to London

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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 return flight deals from Washington to London

Sat, 5 Sep - Tue, 8 Sep

15:55 - 17:40

SEA

LHR

17h 45m

1 stop

06:40 - 13:45

LHR

SEA

15h 05m

1 stop

£553Scandinavian Airlines

Sun, 16 Aug - Sat, 26 Sep

15:55 - 18:30

SEA

LHR

18h 35m

1 stop

06:40 - 13:45

LHR

SEA

15h 05m

1 stop

£554Scandinavian Airlines

Fri, 18 Sep - Tue, 29 Sep

15:55 - 13:35

SEA

LHR

13h 40m

1 stop

06:40 - 13:45

LHR

SEA

15h 05m

1 stop

£557Scandinavian Airlines

Tue, 8 Sep - Sat, 19 Sep

19:00 - 14:40

SEA

LGW

11h 40m

1 stop

15:40 - 20:40

LGW

SEA

13h 00m

1 stop

£557Icelandair

Wed, 12 Aug - Wed, 26 Aug

15:40 - 16:30

SEA

STN

16h 50m

2 stops

11:15 - 20:40

STN

SEA

17h 25m

2 stops

£557Multiple Airlines

Wed, 12 Aug - Wed, 19 Aug

15:40 - 19:05

SEA

LGW

19h 25m

2 stops

09:20 - 11:45

LGW

SEA

34h 25m

2 stops

£559Multiple Airlines

Fri, 2 Oct - Sat, 10 Oct

15:55 - 13:35

SEA

LHR

13h 40m

1 stop

06:40 - 13:45

LHR

SEA

15h 05m

1 stop

£559Scandinavian Airlines

Tue, 13 Oct - Tue, 20 Oct

18:05 - 18:50

SEA

LGW

16h 45m

1 stop

10:20 - 15:40

LGW

SEA

13h 20m

1 stop

£559Condor

Wed, 30 Sep - Mon, 5 Oct

17:40 - 18:45

SEA

LGW

17h 05m

1 stop

10:20 - 16:10

LGW

SEA

13h 50m

1 stop

£560Condor

Tue, 15 Sep - Thu, 17 Sep

14:10 - 17:55

SEA

LCY

19h 45m

1 stop

09:15 - 14:22

LCY

SEA

37h 07m

2 stops

£635Lufthansa

Useful Info

Low season	January
High season	August
Cheapest flight	£207

Best time to beat the crowds (4% less expensive on average)

Most popular time to fly and prices are also 16% lower on average.

Flight from Portland to London Stansted Airport

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 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

Hounslow

Luton

Southend-on-Sea

Slough

Winchester

Stansted

Croydon

Folkestone

Chichester

Maidstone

Colchester

Chelmsford

Crawley

Richmond

Bedford

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 London

Business Class flights to Londonfrom £2,681

Premium Economy Class flights to Londonfrom £1,445

Economy class flights to Londonfrom £559

£207 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