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>

$221 CHEAP FLIGHTS from Washington to London

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

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Cheap Flights from Washington to London

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

Tue, Apr 21 - Tue, Apr 28

3:40 pm - 4:25 pm

SEA

LHR

16h 45m

2 stops

7:05 am - 5:55 pm

LHR

SEA

18h 50m

2 stops

$616Multiple Airlines

Tue, Apr 21 - Tue, Apr 28

7:00 pm - 10:20 pm

SEA

LGW

19h 20m

2 stops

6:25 am - 8:40 pm

LGW

SEA

22h 15m

2 stops

$617Multiple Airlines

Sun, Apr 26 - Tue, May 12

3:40 pm - 5:15 pm

SEA

STN

17h 35m

2 stops

6:30 am - 6:45 pm

STN

SEA

20h 15m

2 stops

$618Multiple Airlines

Tue, Aug 25 - Fri, Aug 28

3:55 pm - 12:55 pm

SEA

LHR

37h 00m

2 stops

6:40 am - 1:45 pm

LHR

SEA

15h 05m

1 stop

$621Scandinavian Airlines

Tue, Aug 25 - Fri, Aug 28

3:55 pm - 12:55 pm

SEA

LHR

37h 00m

2 stops

7:05 am - 1:45 pm

LHR

SEA

14h 40m

2 stops

$625Scandinavian Airlines

Mon, Apr 27 - Tue, May 12

3:30 pm - 11:45 am

PDX

LGW

12h 15m

1 stop

3:40 pm - 6:00 pm

LGW

PDX

34h 20m

1 stop

$710Icelandair

Mon, Apr 27 - Tue, May 12

3:30 pm - 8:20 pm

PDX

LHR

20h 50m

1 stop

9:25 pm - 6:00 pm

LHR

PDX

28h 35m

1 stop

$711Icelandair

Mon, Apr 20 - Thu, May 7

2:10 pm - 5:55 pm

SEA

LCY

19h 45m

1 stop

9:15 am - 6:30 pm

LCY

SEA

17h 15m

2 stops

$806Lufthansa

Sun, Apr 19 - Tue, May 5

5:35 pm - 4:40 pm

SEA

LCY

15h 05m

1 stop

10:00 am - 4:30 pm

LCY

SEA

14h 30m

1 stop

$833Delta

Wed, Apr 22 - Wed, Apr 29

2:10 pm - 5:55 pm

SEA

LCY

19h 45m

1 stop

9:15 am - 4:59 pm

LCY

SEA

15h 44m

2 stops

$838Lufthansa

Useful Info

Low season	January
High season	August
Cheapest flight	$221

Best time to beat the crowds with an average 3% drop in price.

Most popular time to fly and prices are also 17% 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

Crawley

Watford

Ilford

Eastbourne

Guildford

Bedford

Colchester

St. Albans

Kingston upon Thames

Twickenham

Ipswich

Maidenhead

Barnet

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 $3,064

Premium Economy Class flights to Londonfrom $1,559

Economy Class flights to Londonfrom $621

$221 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

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