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>

$230 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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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

$525

Overall average: $583

Icelandair

seg 3/16dom 4/5

SEA - LGW • 1 stop

Cheapest non-stop

$554

Typical prices: $811-$1,503

Virgin Atlantic

ter 12/9ter 12/23

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

seg, mar 16 - dom, abr 5

3:35 pm - 10:55 amSEA-LGW

12h 20m1 stop

3:40 pm - 8:45 pmLGW-SEA

13h 05m1 stop

$525Icelandair

Find Deal

dom, abr 5 - dom, abr 12

7:00 pm - 2:40 pmSEA-LGW

11h 40m1 stop

3:40 pm - 5:50 pmLGW-SEA

34h 10m1 stop

$527Icelandair

Find Deal

qua, nov 26 - qua, dez 3

8:05 pm - 6:55 pmSEA-LGW

14h 50m1 stop

10:10 am - 6:20 pmLGW-SEA

16h 10m1 stop

$528Multiple Airlines

Find Deal

sex, jan 30 - dom, fev 8

2:35 pm - 8:35 pmSEA-STN

22h 00m2 stops

5:55 am - 5:00 pmSTN-SEA

19h 05m2 stops

$540Multiple Airlines

Find Deal

qua, jan 14 - qui, jan 29

6:00 am - 7:05 amPDX-LHR

17h 05m1 stop

11:05 am - 5:35 pmLHR-PDX

14h 30m1 stop

$567Virgin Atlantic

Find Deal

qua, dez 3 - qua, dez 10

1:45 pm - 10:00 amPDX-LHR

12h 15m1 stop

6:30 am - 11:25 amLHR-PDX

12h 55m1 stop

$580KLM

Find Deal

ter, nov 25 - qua, dez 3

12:35 am - 7:05 amPDX-LHR

22h 30m1 stop

6:30 am - 11:25 amLHR-PDX

12h 55m1 stop

$581Delta

Find Deal

seg, fev 16 - ter, mar 3

1:20 pm - 10:00 amGEG-LHR

12h 40m1 stop

6:20 am - 2:57 pmLHR-GEG

16h 37m2 stops

$597Delta

Find Deal

qua, dez 10 - qua, dez 17

6:00 am - 6:50 amGEG-LHR

16h 50m2 stops

1:05 pm - 11:59 pmLHR-GEG

18h 54m2 stops

$600Virgin Atlantic

Find Deal

ter, fev 17 - qua, mar 4

9:55 am - 10:00 amGEG-LHR

16h 05m1 stop

11:05 am - 7:59 pmLHR-GEG

16h 54m1 stop

$604KLM

Find Deal

Useful Info

Low season	January
High season	August
Cheapest flight	$230

Best time to beat the crowds but there is an average 1% increase in price.

Most popular time to fly and prices are also 20% 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

Twickenham

Harrow

Bedford

Hastings

Worthing

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 $1,574

Economy Class flights to Londonfrom $521

$230 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