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>

$261 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

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

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

Cheapest round-trip

$551

Overall average: $703

Icelandair

vie. 5/1mar. 5/12

SEA - LHR • 1 stop

Cheapest non-stop

$585

Typical prices: $626-$892

British Airways

dom. 2/15vie. 2/27

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

vie., may. 1 - mar., may. 12

3:40 pm - 11:55 am

SEA

LHR

12h 15m

1 stop

1:05 pm - 5:55 pm

LHR

SEA

12h 50m

1 stop

$551Icelandair

dom., may. 3 - vie., may. 15

3:40 pm - 11:55 am

SEA

LHR

12h 15m

1 stop

1:05 pm - 8:40 pm

LHR

SEA

15h 35m

1 stop

$552Icelandair

dom., feb. 1 - mar., feb. 17

3:40 pm - 11:50 am

SEA

LHR

12h 10m

1 stop

2:30 pm - 7:16 pm

LHR

SEA

12h 46m

1 stop

$555Lufthansa

mié., mar. 4 - mié., mar. 18

6:50 pm - 12:20 pm

SEA

LHR

9h 30mnonstop

12:10 pm - 7:20 pm

LHR

SEA

14h 10m

1 stop

$556British Airways

dom., mar. 1 - dom., mar. 8

10:05 am - 11:50 am

SEA

LHR

17h 45m

1 stop

7:40 am - 6:16 pm

LHR

SEA

18h 36m

2 stops

$559Multiple Airlines

lun., feb. 23 - lun., mar. 2

3:40 pm - 11:50 am

SEA

LHR

12h 10m

1 stop

6:30 am - 12:10 pm

LHR

SEA

13h 40m

1 stop

$560Lufthansa

dom., mar. 1 - dom., mar. 8

2:35 pm - 10:30 pm

SEA

LTN

23h 55m

2 stops

6:20 am - 5:00 pm

LTN

SEA

18h 40m

2 stops

$560Multiple Airlines

dom., feb. 1 - mar., feb. 17

3:40 pm - 11:50 am

SEA

LHR

12h 10m

1 stop

2:30 pm - 7:16 pm

LHR

SEA

12h 46m

1 stop

$561Air Canada

dom., feb. 15 - vie., feb. 27

6:50 pm - 12:20 pm

SEA

LHR

9h 30mnonstop

8:50 am - 6:20 pm

LHR

SEA

17h 30m

1 stop

$562British Airways

mar., feb. 3 - mar., feb. 10

3:15 pm - 7:10 am

PDX

LHR

31h 55m

2 stops

1:25 pm - 9:15 am

LHR

PDX

27h 50m

2 stops

$600Air Canada

Useful Info

Low season	January
High season	August
Cheapest flight	$261

Best time to beat the crowds but there is an average 2% 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 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

Ipswich

Twickenham

Bedford

Barnet

Harrow

Hastings

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

Prem Econ Class flights to Londonfrom $1,486

Economy Class flights to Londonfrom $495

$254 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