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>

$288 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 round-trip 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 round-trip flight deals from Washington to London

Mon, Nov 10 - Mon, Nov 24

2:35 pm - 10:55 amSEA-LGW

12h 20m1 stop

11:55 am - 5:00 pmLGW-SEA

13h 05m1 stop

$518Icelandair

Find Deal

Sun, Mar 22 - Tue, Mar 31

3:35 pm - 10:50 amSEA-LHR

12h 15m1 stop

9:25 pm - 5:50 pmLHR-SEA

28h 25m1 stop

$518Icelandair

Find Deal

Wed, Nov 12 - Wed, Nov 19

2:35 pm - 6:55 pmSEA-LGW

20h 20m2 stops

8:50 am - 5:00 pmLGW-SEA

16h 10m2 stops

$520Multiple Airlines

Find Deal

Thu, Jan 8 - Thu, Jan 15

2:35 pm - 7:45 pmSEA-LGW

21h 10m2 stops

8:50 am - 5:00 pmLGW-SEA

16h 10m2 stops

$523Multiple Airlines

Find Deal

Sun, Nov 30 - Fri, Dec 5

8:05 pm - 3:35 pmSEA-LHR

11h 30m1 stop

8:50 am - 6:20 pmLHR-SEA

17h 30m1 stop

$554Aer Lingus

Find Deal

Mon, Nov 24 - Fri, Dec 5

8:05 pm - 3:35 pmSEA-LHR

11h 30m1 stop

12:10 pm - 6:20 pmLHR-SEA

14h 10m1 stop

$558Aer Lingus

Find Deal

Sun, Dec 7 - Wed, Dec 17

3:40 pm - 11:50 amSEA-LHR

12h 10m1 stop

7:40 am - 1:20 pmLHR-SEA

13h 40m1 stop

$562Lufthansa

Find Deal

Wed, Jan 14 - Thu, Jan 29

6:00 am - 7:05 amPDX-LHR

17h 05m1 stop

11:05 am - 5:35 pmLHR-PDX

14h 30m1 stop

$568Virgin Atlantic

Find Deal

Wed, Jan 14 - Thu, Jan 29

6:00 am - 7:05 amPDX-LHR

17h 05m1 stop

11:05 am - 5:35 pmLHR-PDX

14h 30m1 stop

$570Virgin Atlantic

Find Deal

Tue, Nov 11 - Tue, Nov 25

3:40 pm - 11:50 amSEA-LHR

12h 10m1 stop

7:40 am - 7:16 pmLHR-SEA

19h 36m2 stops

$572Lufthansa

Find Deal

Cheapest round-trip

$518

Overall average: $594

Icelandair

Mon 11/10Mon 11/24

SEA - LGW • 1 stop

Cheapest non-stop

$561

Typical prices: $808-$1,457

Air France

Tue 12/2Tue 12/9

SEA - LHR • Non-stop

Start a new search

KAYAK searches 100s 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	$266

Best time to beat the crowds with an average 0% drop in price.

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 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

Wembley

Hayes

Richmond

Luton

Ilford

Crawley

Guildford

Watford

Kingston upon Thames

Eastbourne

Colchester

Ipswich

St. Albans

Harrow

Bedford

Hastings

Worthing

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 $2,344

Prem Econ Class flights to Londonfrom $1,584

Economy Class flights to Londonfrom $547

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

$266 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

Everything you should know

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