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 round-trip 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>

$248 CHEAP FLIGHTS from Washington to London

KAYAK searches hundreds of travel sites at once for deals on flights 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 round-trip flight deals from Washington to London

Sun, Apr 26 - Tue, May 12

3:40 pm - 5:15 pm

SEA

STN

17h 35m

2 stops

10:00 pm - 9:40 am

STN

SEA

43h 40m

3 stops

$641Multiple Airlines

Fri, Sep 18 - Mon, Sep 21

3:55 pm - 9:20 am

SEA

LHR

33h 25m

1 stop

6:40 am - 1:45 pm

LHR

SEA

39h 05m

2 stops

$641Scandinavian Airlines

Mon, Apr 13 - Wed, Apr 22

6:10 pm - 6:50 pm

SEA

LGW

16h 40m

1 stop

10:20 am - 3:40 pm

LGW

SEA

13h 20m

1 stop

$645Condor

Tue, Apr 21 - Wed, Apr 29

7:00 pm - 8:20 pm

SEA

LHR

17h 20m

1 stop

9:25 pm - 5:55 pm

LHR

SEA

28h 30m

1 stop

$653Icelandair

Sun, Apr 19 - Tue, Apr 28

5:40 pm - 2:40 pm

SEA

LGW

13h 00m

1 stop

10:20 am - 3:40 pm

LGW

SEA

13h 20m

1 stop

$668Condor

Fri, Aug 14 - Fri, Sep 18

7:05 pm - 11:55 am

PDX

LHR

32h 50m

1 stop

1:05 pm - 5:55 pm

LHR

PDX

12h 50m

1 stop

$723Icelandair

Mon, Sep 14 - Tue, Sep 22

4:35 pm - 6:40 pm

SEA

LCY

18h 05m

1 stop

9:15 am - 6:32 pm

LCY

SEA

17h 17m

2 stops

$833SWISS

Tue, Apr 28 - Tue, May 5

2:10 pm - 5:55 pm

SEA

LCY

19h 45m

1 stop

9:15 am - 6:30 pm

LCY

SEA

17h 15m

2 stops

$846Lufthansa

Tue, Apr 28 - Tue, May 5

2:10 pm - 5:55 pm

SEA

LCY

19h 45m

1 stop

9:15 am - 6:30 pm

LCY

SEA

17h 15m

2 stops

$848Lufthansa

Tue, Aug 18 - Wed, Sep 30

10:30 am - 5:25 pm

SEA

LCY

22h 55m

2 stops

9:15 am - 6:32 pm

LCY

SEA

17h 17m

2 stops

$877SWISS

Useful Info

Low season	January
High season	August
Cheapest flight	$248

Best time to beat the crowds with an average 3% drop in price.

Most popular time to fly and prices are also 17% lower on average.

Flight from Portland to London Stansted Airport

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 round-trip 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.

Hounslow

Slough

Hayes

Wembley

Richmond

Luton

Crawley

Watford

Ilford

Eastbourne

Guildford

Bedford

Colchester

St. Albans

Kingston upon Thames

Twickenham

Ipswich

Maidenhead

Barnet

Harrow

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 $5,751

Business Class flights to Londonfrom $3,064

Premium Economy Class flights to Londonfrom $1,559

Economy Class flights to Londonfrom $664

$248 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 round-trip 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

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 round-trip 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.

Traveling 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 rental

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