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>

$166 CHEAP FLIGHTS from Washington to London

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

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Flights 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

Tue, Aug 26 - Tue, Sep 2

7:35 pm - 6:10 pmSEA-STN

14h 35m1 stop

11:15 am - 5:50 pmSTN-SEA

14h 35m1 stop

$414

Find Deal

Tue, Aug 26 - Tue, Sep 2

7:35 pm - 10:10 pmSEA-LTN

18h 35m1 stop

10:00 am - 5:50 pmLTN-SEA

15h 50m1 stop

$419

Find Deal

Fri, Oct 3 - Thu, Oct 9

4:20 pm - 9:20 amSEA-LHR

33h 00m1 stop

5:30 pm - 2:00 pmLHR-SEA

28h 30m2 stops

$420Scandinavian Airlines

Find Deal

Fri, Oct 3 - Sat, Oct 11

4:20 pm - 9:20 amSEA-LHR

33h 00m1 stop

6:40 am - 2:00 pmLHR-SEA

39h 20m2 stops

$423Scandinavian Airlines

Find Deal

Sun, Aug 3 - Tue, Aug 19

7:35 pm - 3:55 pmSEA-LHR

12h 20m1 stop

1:25 pm - 5:50 pmLHR-SEA

12h 25m1 stop

$471Aer Lingus

Find Deal

Sun, Nov 9 - Wed, Nov 19

8:05 pm - 7:50 pmSEA-LHR

15h 45m1 stop

9:50 am - 6:20 pmLHR-SEA

16h 30m1 stop

$472Aer Lingus

Find Deal

Thu, Oct 2 - Sun, Oct 5

7:00 pm - 2:40 pmSEA-LGW

11h 40m1 stop

3:40 pm - 8:40 pmLGW-SEA

13h 00m1 stop

$478Icelandair

Find Deal

Mon, Oct 6 - Sun, Oct 19

7:00 pm - 2:35 pmSEA-LGW

11h 35m1 stop

3:40 pm - 5:50 pmLGW-SEA

34h 10m1 stop

$483Icelandair

Find Deal

Wed, Aug 6 - Wed, Aug 13

8:20 pm - 1:40 pmSEA-LHR

9h 20mnonstop

10:20 am - 4:00 pmLHR-SEA

13h 40m1 stop

$487American Airlines

Find Deal

Mon, Aug 4 - Wed, Aug 13

1:30 pm - 6:50 amSEA-LHR

9h 20mnonstop

10:20 am - 4:00 pmLHR-SEA

13h 40m1 stop

$488American Airlines

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	$166

Best time to beat the crowds with an average 5% drop in price.

Most popular time to fly with an average 24% increase in price.

Flight from Seattle to London Heathrow 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.

Ilford

Deal

Southall

St. Albans

Folkestone

Barnet

Bishop's Stortford

Ascot

Enfield

Ely

Rye

Edgware

Weybridge

Alton

Woodstock

Beaconsfield

Hatfield

Dorking

Burford

Epsom

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 $2,341

Business Class flights to Londonfrom $3,166

Prem Econ Class flights to Londonfrom $1,639

Economy Class flights to Londonfrom $539

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

$166 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