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>

$250 CHEAP FLIGHTS from Washington to London

KAYAK searches hundreds of travel sites at once for deals on flights to London

...and more

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Cheapest round-trip

$541

Overall average: $634

Icelandair

Sun 5/3Wed 5/13

SEA - LGW • 1 stop

Cheapest non-stop

$634

Typical prices: $618-$827

Virgin Atlantic

Sat 2/28Sat 3/7

SEA - LHR • Non-stop

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KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to London!

Flight Deals

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, May 3 - Wed, May 13

3:40 pm - 2:40 pm

SEA

LGW

15h 00m

1 stop

3:40 pm - 8:40 pm

LGW

SEA

13h 00m

1 stop

$541Icelandair

Wed, Apr 22 - Thu, Apr 30

3:40 pm - 2:40 pm

SEA

LGW

15h 00m

1 stop

3:40 pm - 8:40 pm

LGW

SEA

13h 00m

1 stop

$542Icelandair

Wed, Apr 1 - Wed, Apr 8

3:40 pm - 9:15 pm

SEA

LTN

21h 35m

2 stops

6:15 am - 5:55 pm

LTN

SEA

19h 40m

2 stops

$552Multiple Airlines

Wed, Mar 11 - Tue, Mar 17

4:10 pm - 10:40 pm

SEA

STN

23h 30m

2 stops

6:05 pm - 2:20 pm

STN

SEA

27h 15m

2 stops

$554Multiple Airlines

Mon, Mar 2 - Wed, Mar 18

9:50 am - 11:50 am

PDX

LHR

18h 00m

1 stop

8:45 am - 12:35 am

LHR

PDX

22h 50m

2 stops

$599Lufthansa

Mon, Mar 2 - Wed, Mar 18

9:50 am - 11:50 am

PDX

LHR

18h 00m

1 stop

11:10 am - 12:35 am

LHR

PDX

20h 25m

2 stops

$600Lufthansa

Wed, Mar 11 - Mon, Mar 23

7:02 am - 12:00 pm

GEG

LHR

21h 58m

1 stop

7:40 am - 9:03 pm

LHR

GEG

20h 23m

2 stops

$633United Airlines

Wed, Mar 4 - Mon, Mar 9

9:55 am - 10:00 am

GEG

LHR

16h 05m

1 stop

6:30 am - 9:29 pm

LHR

GEG

21h 59m

2 stops

$634Delta

Wed, Mar 4 - Mon, Mar 9

12:38 pm - 12:00 pm

GEG

LHR

15h 22m

1 stop

7:40 am - 9:03 pm

LHR

GEG

20h 23m

2 stops

$635United Airlines

Mon, Apr 13 - Mon, Apr 27

5:30 pm - 4:40 pm

SEA

LCY

15h 10m

1 stop

9:20 am - 11:45 am

LCY

SEA

34h 25m

1 stop

$671Delta

Useful Info

Low season	January
High season	August
Cheapest flight	$250

Best time to beat the crowds with an average 6% drop in price.

Most popular time to fly and prices are also 19% 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

Ilford

Crawley

Watford

Guildford

Eastbourne

Kingston upon Thames

Colchester

St. Albans

Twickenham

Ipswich

Bedford

Barnet

Harrow

Maidenhead

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 $1,312

Premium Economy Class flights to Londonfrom $1,540

Economy Class flights to Londonfrom $482

$250 Find Cheap Flights from Washington to London

KAYAK searches hundreds of travel sites at once for deals on flights to London

Everything you should know

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