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>

$241 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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Cheapest round-trip

$543

Overall average: $738

Icelandair

Mon 4/13Sat 4/25

SEA - LGW • 1 stop

Cheapest non-stop

$585

Typical prices: $640-$834

Virgin Atlantic

Mon 3/16Wed 4/1

SEA - LHR • Non-stop

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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

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, Apr 13 - Sat, Apr 25

7:00 pm - 2:40 pm

SEA

LGW

11h 40m

1 stop

3:40 pm - 8:40 pm

LGW

SEA

13h 00m

1 stop

$543Icelandair

Mon, Apr 13 - Tue, Apr 21

3:40 pm - 11:55 am

SEA

LHR

12h 15m

1 stop

1:05 pm - 8:40 pm

LHR

SEA

15h 35m

1 stop

$543Icelandair

Mon, Mar 9 - Sun, Mar 15

3:35 pm - 6:50 pm

SEA

STN

20h 15m

2 stops

6:00 pm - 6:00 pm

STN

SEA

31h 00m

2 stops

$546Multiple Airlines

Mon, Apr 13 - Mon, Apr 20

3:40 pm - 7:50 pm

SEA

STN

20h 10m

2 stops

7:15 am - 8:40 pm

STN

SEA

21h 25m

2 stops

$551Multiple Airlines

Mon, Mar 9 - Mon, Mar 16

4:05 pm - 6:25 pm

SEA

LCY

19h 20m

1 stop

6:55 pm - 12:35 pm

LCY

SEA

24h 40m

1 stop

$654Virgin Atlantic

Mon, Mar 9 - Mon, Mar 16

4:05 pm - 6:25 pm

SEA

LCY

19h 20m

1 stop

7:45 am - 10:10 pm

LCY

SEA

21h 25m

2 stops

$664Virgin Atlantic

Wed, Mar 25 - Fri, Apr 3

4:05 pm - 4:35 pm

SEA

LCY

17h 30m

1 stop

9:40 am - 4:30 pm

LCY

SEA

14h 50m

1 stop

$669Delta

Sun, Mar 8 - Thu, Mar 19

2:25 pm - 9:30 am

PDX

LCY

12h 05m

1 stop

9:20 am - 12:25 pm

LCY

PDX

34h 05m

1 stop

$683Delta

Wed, Mar 11 - Wed, Mar 18

1:39 pm - 5:05 pm

PDX

LCY

20h 26m

2 stops

9:20 am - 11:04 pm

LCY

PDX

20h 44m

2 stops

$696SWISS

Mon, Mar 9 - Tue, Mar 17

1:39 pm - 5:05 pm

PDX

LCY

20h 26m

2 stops

9:15 am - 10:45 pm

LCY

PDX

20h 30m

2 stops

$697SWISS

Useful Info

Low season	January
High season	August
Cheapest flight	$241

Best time to beat the crowds with an average 6% drop in price.

Most popular time to fly and prices are also 20% lower on average.

Flight from Portland to London Luton 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

Harrow

Maidenhead

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

Premium Economy Class flights to Londonfrom $1,484

Economy Class flights to Londonfrom $492

$241 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