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>

$283 CHEAP FLIGHTS from Washington to London

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

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$575

Typical prices: $626-$888

Icelandair

Sun 2/15Fri 2/27

SEA - LHR • 1 stop

Cheapest non-stop

$613

Typical prices: $621-$886

Virgin Atlantic

Sun 1/18Sat 1/31

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!

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

Sun, Feb 15 - Fri, Feb 27

2:35 pm - 10:50 am

SEA

LHR

12h 15m1 stop

12:15 pm - 5:00 pm

LHR

SEA

12h 45m1 stop

$575Icelandair

Wed, Jan 14 - Mon, Jan 19

3:10 pm - 6:10 pm

SEA

STN

19h 00m2 stops

6:45 pm - 7:16 pm

STN

SEA

32h 31m3 stops

$578Multiple Airlines

Fri, Jan 16 - Thu, Jan 29

2:35 pm - 10:55 am

SEA

LGW

12h 20m1 stop

11:55 am - 5:00 pm

LGW

SEA

13h 05m1 stop

$578Icelandair

Thu, Feb 5 - Thu, Feb 12

10:58 am - 7:55 am

SEA

LHR

12h 57m1 stop

6:50 am - 7:03 pm

LHR

SEA

20h 13m2 stops

$579Brussels Airlines

Sun, Jan 18 - Sat, Jan 31

3:10 pm - 9:45 pm

SEA

STN

22h 35m2 stops

4:55 pm - 1:20 pm

STN

SEA

28h 25m2 stops

$579Multiple Airlines

Wed, Jan 21 - Wed, Jan 28

7:00 am - 5:55 am

SEA

LHR

14h 55m1 stop

6:50 am - 8:57 pm

LHR

SEA

22h 07m2 stops

$582Brussels Airlines

Tue, Jan 20 - Tue, Jan 27

9:55 am - 11:50 am

SEA

LHR

17h 55m1 stop

6:35 am - 7:16 pm

LHR

SEA

20h 41m2 stops

$584Lufthansa

Mon, Jan 19 - Mon, Jan 26

3:40 pm - 11:50 am

SEA

LHR

12h 10m1 stop

8:15 pm - 7:16 pm

LHR

SEA

31h 01m2 stops

$589Lufthansa

Wed, Feb 4 - Wed, Feb 11

10:58 am - 5:50 pm

SEA

LGW

22h 52m2 stops

6:40 pm - 10:43 pm

LGW

SEA

36h 03m2 stops

$605SWISS

Sat, Jan 31 - Wed, Feb 18

10:47 am - 5:50 pm

PDX

LGW

47h 03m2 stops

6:40 pm - 10:40 pm

LGW

PDX

36h 00m2 stops

$639SWISS

Useful Info

Low season	January
High season	August
Cheapest flight	$283

Best time to beat the crowds with an average 1% drop in price.

Most popular time to fly and prices are also 22% 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

Wembley

Hayes

Richmond

Luton

Ilford

Crawley

Watford

Guildford

Eastbourne

Kingston upon Thames

Colchester

St. Albans

Ipswich

Bedford

Twickenham

Barnet

Hastings

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 $2,179

Prem Econ Class flights to Londonfrom $1,486

Economy Class flights to Londonfrom $482

$283 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