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.

£188 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.

Return

One-way

Last minute

Direct

Recent return flight deals from Washington to London

Thu, 10 Sep - Thu, 17 Sep

05:50 - 19:15

SEA

LGW

29h 25m

3 stops

19:55 - 11:55

LGW

SEA

24h 00m

2 stops

£472Multiple Airlines

Sun, 20 Sep - Mon, 28 Sep

15:40 - 19:15

SEA

LGW

19h 35m

2 stops

20:45 - 20:40

LGW

SEA

31h 55m

3 stops

£472Multiple Airlines

Thu, 10 Sep - Thu, 17 Sep

08:00 - 19:15

SEA

LGW

27h 15m

2 stops

19:55 - 11:55

LGW

SEA

24h 00m

2 stops

£473Multiple Airlines

Thu, 17 Dec - Fri, 18 Dec

13:40 - 07:10

SEA

LHR

9h 30mdirect

14:55 - 16:50

LHR

SEA

9h 55mdirect

£549British Airways

Wed, 14 Oct - Thu, 22 Oct

13:30 - 06:45

SEA

LHR

9h 15mdirect

16:30 - 18:25

LHR

SEA

9h 55mdirect

£573British Airways

Wed, 4 Nov - Sat, 14 Nov

14:07 - 12:00

SEA

LHR

13h 53m

1 stop

14:55 - 16:50

LHR

SEA

9h 55mdirect

£612British Airways

Tue, 8 Sep - Tue, 15 Sep

17:30 - 11:20

SEA

LHR

9h 50mdirect

09:55 - 16:35

LHR

SEA

14h 40m

1 stop

£614Virgin Atlantic

Wed, 4 Nov - Wed, 18 Nov

18:55 - 12:20

SEA

LHR

9h 25mdirect

14:45 - 16:50

LHR

SEA

10h 05mdirect

£621Alaska Airlines

Tue, 8 Dec - Fri, 15 Jan

18:55 - 12:20

SEA

LHR

9h 25mdirect

14:45 - 16:50

LHR

SEA

10h 05mdirect

£621Alaska Airlines

Tue, 8 Sep - Tue, 15 Sep

17:30 - 11:20

SEA

LHR

9h 50mdirect

17:45 - 20:10

LHR

SEA

10h 25mdirect

£636Virgin Atlantic

Useful Info

Low season	January
High season	August
Cheapest flight	£188

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

Most popular time to fly (8% more expensive on average)

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 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

Winchester

Slough

Stansted

Croydon

Folkestone

Newport

Chichester

Colchester

Maidstone

Crawley

Chelmsford

Bedford

Hastings

Richmond

Everything you need to know for your flight to London

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Cabin class types available on flights to Washington

First Class flights to London

Business Class flights to Londonfrom £2,719

Premium Economy Class flights to Londonfrom £1,783

Economy class flights to Londonfrom £687

£188 Find Cheap Flights from Washington to London – Compare and Save

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

Low season

High season

Cheapest flight

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

FAQs for booking flights from Washington to London

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

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