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>

$260 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 24% or moreCompare multiple travel sites with one search.

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

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

Cheapest round-trip

$556

Typical prices: $615-$861

Icelandair

Mon 1/12Sat 1/17

SEA - LHR • 1 stop

Cheapest non-stop

$600

Typical prices: $622-$882

Virgin Atlantic

Thu 1/29Thu 2/12

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

Mon, Jan 12 - Sat, Jan 17

2:35 pm - 10:50 am

SEA

LHR

12h 15m1 stop

12:15 pm - 5:00 pm

LHR

SEA

12h 45m1 stop

$556Icelandair

Thu, Jan 29 - Thu, Feb 12

2:35 pm - 4:00 pm

SEA

LTN

17h 25m2 stops

9:00 am - 5:00 pm

LTN

SEA

16h 00m2 stops

$558Multiple Airlines

Wed, May 6 - Tue, May 19

7:00 pm - 2:40 pm

SEA

LGW

11h 40m1 stop

1:00 pm - 5:55 pm

LGW

SEA

12h 55m1 stop

$560Icelandair

Mon, Jan 26 - Mon, Feb 2

8:10 am - 6:40 am

SEA

LHR

14h 30m1 stop

6:00 am - 8:57 pm

LHR

SEA

22h 57m2 stops

$566Austrian Airlines

Thu, Jan 29 - Fri, Feb 6

7:00 am - 7:55 am

SEA

LHR

16h 55m1 stop

6:50 am - 8:57 pm

LHR

SEA

22h 07m2 stops

$570Brussels Airlines

Tue, Jan 27 - Tue, Feb 3

10:58 am - 7:55 am

SEA

LHR

12h 57m1 stop

6:50 am - 6:14 pm

LHR

SEA

19h 24m2 stops

$571Brussels Airlines

Fri, Feb 13 - Fri, Feb 20

3:40 pm - 11:50 am

SEA

LHR

12h 10m1 stop

6:35 am - 1:20 pm

LHR

SEA

14h 45m1 stop

$573Lufthansa

Wed, Mar 4 - Wed, Mar 11

12:38 pm - 12:00 pm

GEG

LHR

15h 22m1 stop

6:35 am - 9:18 pm

LHR

GEG

21h 43m2 stops

$598Lufthansa

Mon, Mar 16 - Thu, Apr 23

9:55 am - 10:30 am

PDX

LHR

17h 35m2 stops

6:30 am - 11:10 am

LHR

PDX

12h 40m1 stop

$641Delta

Wed, Apr 22 - Wed, Apr 29

9:05 am - 12:10 pm

PDX

LHR

19h 05m1 stop

6:30 am - 2:38 pm

LHR

PDX

16h 08m2 stops

$646Delta

Useful Info

Low season	January
High season	August
Cheapest flight	$260

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

Most popular time to fly and prices are also 21% lower on average.

Flight from Portland to London Heathrow 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

Kingston upon Thames

Eastbourne

Colchester

St. Albans

Ipswich

Bedford

Twickenham

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 $2,179

Prem Econ Class flights to Londonfrom $1,482

Economy Class flights to Londonfrom $482

$260 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