What is the cheapest airline that flies from Washington to London?

WestJet is the most popular carrier operating from Washington to London

How many flights depart from State of Washington to London on average per week?

The number of flights available between State of Washington and London is 185 per week as of August 2025. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.

How many flights depart from State of Washington to London on average per day?

The number of flights available between State of Washington and London is 26 per day as of August 2025. The most frequent departure time is 20:00, with 57% of daily flights leaving in the evening.

Which airlines fly to London?

Virgin Atlantic, British Airways and Icelandair are the top three most popular airlines that fly to London from State of Washington according to our data. Virgin Atlantic is the first choice among our users, with 59% of people opting to fly with this airline when travelling to London. Keep in mind that there are 3 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to London?

Flight times from State of Washington to London vary, but if you’re flying out of Seattle and flying into London Heathrow Airport (one of the most popular routes), then the duration is 9h 20m on average. Another popular route from State of Washington to London is flying from Spokane to London Heathrow Airport, which will take roughly 12h 02m. Keep in mind that layovers or delays could extend your travel time.

When did momondo last update prices for flights from Washington to London?

Prices for flights from Washington to London were last updated today.

How many operators does momondo search for flights from Washington to London?

As of August 2025, there are 4 operators available to choose from for flights from Washington to London.

How old do you have to be to fly from Washington to London?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to London.

What documentation or ID do you need to fly to London?

The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

£159 Cheap Flights from Washington to London in 2025

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Find the cheapest flights from Washington to London

Round-trip

One-way

Last minute

Direct

Cheap return flights

20:05 - 17:50SEA-LHR

13h 45m1 stop

12:10 - 18:20LHR-SEA

14h 10m1 stop

£347Aer Lingus

Find Deal

Wed, 26 Nov - Wed, 10 Dec

20:05 - 19:50SEA-LHR

15h 45m1 stop

08:50 - 18:20LHR-SEA

17h 30m1 stop

£349Aer Lingus

Find Deal

Wed, 12 Nov - Wed, 26 Nov

19:00 - 14:35SEA-LGW

11h 35m1 stop

15:40 - 20:40LGW-SEA

13h 00m1 stop

£355Icelandair

Find Deal

Mon, 29 Sep - Mon, 6 Oct

15:45 - 14:35SEA-LGW

14h 50m1 stop

15:40 - 17:50LGW-SEA

34h 10m1 stop

£355Icelandair

Find Deal

Mon, 6 Oct - Sun, 19 Oct

11:11 - 09:40SEA-LHR

14h 29m1 stop

12:20 - 21:15LHR-SEA

16h 55m1 stop

£357Lufthansa

Find Deal

Sun, 21 Sep - Tue, 30 Sep

07:15 - 09:35SEA-LHR

18h 20m1 stop

06:55 - 16:59LHR-SEA

18h 04m1 stop

£358

Find Deal

Wed, 10 Sep - Wed, 17 Sep

07:15 - 09:35SEA-LHR

18h 20m1 stop

08:40 - 18:36LHR-SEA

17h 56m2 stops

£360

Find Deal

Wed, 10 Sep - Wed, 17 Sep

07:15 - 06:30SEA-LHR

15h 15m1 stop

14:10 - 22:26LHR-SEA

16h 16m1 stop

£363Air Canada

Find Deal

Sun, 14 Sep - Tue, 14 Oct

09:55 - 11:50PDX-LHR

17h 55m2 stops

14:10 - 18:46LHR-PDX

12h 36m1 stop

£382Air Canada

Find Deal

Sun, 5 Oct - Tue, 21 Oct

13:55 - 11:45SEA-LHR

13h 50m1 stop

09:00 - 16:59LHR-SEA

15h 59m1 stop

£383Lufthansa

Find Deal

Wed, 27 Aug - Wed, 3 Sep

United Airlines flights from State of Washington to London

Our best United Airlines deals on State of Washington to London flight tickets

United Airlines

23 Sept

SEA12:43Seattle/Tacoma Intl

12h 57m

1 stop

LHR09:40London Heathrow

30 Sept

LHR12:20London Heathrow

16h 55m

1 stop

SEA21:15Seattle/Tacoma Intl

£364

Find similar

United Airlines

24 Aug

SEA17:35Seattle/Tacoma Intl

29h 50m

1 stop

LHR07:25London Heathrow

9 Sept

LHR10:35London Heathrow

16h 14m

1 stop

SEA18:49Seattle/Tacoma Intl

£368

Find similar

United Airlines

26 Nov

SEA05:50Seattle/Tacoma Intl

22h 00m

1 stop

LHR11:50London Heathrow

10 Dec

LHR13:25London Heathrow

41h 03m

2 stops

SEA22:28Seattle/Tacoma Intl

£371

Find similar

Iberia flights from State of Washington to London

Our best Iberia deals on State of Washington to London flight tickets

Iberia

24 Aug

SEA15:09Seattle/Tacoma Intl

18h 06m

2 stops

LHR17:15London Heathrow

4 Sept

LHR12:15London Heathrow

15h 54m

1 stop

SEA20:09Seattle/Tacoma Intl

£401

Find similar

Iberia

24 Nov

PDX17:45Portland

9h 35m

LHR11:20London Heathrow

4 Dec

LHR16:30London Heathrow

36h 28m

1 stop

PDX20:58Portland

£406

Find similar

Iberia

19 Oct

PDX19:25Portland

9h 35m

LHR13:00London Heathrow

29 Oct

LHR10:05London Heathrow

18h 42m

1 stop

PDX21:47Portland

£409

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 26/11

20:05-17:50

1 stop13h 45m

London Heathrow

Wed 10/12

12:10-18:20

1 stop14h 10m

£347

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 12/11

20:05-19:50

1 stop15h 45m

London Heathrow

Wed 26/11

08:50-18:20

1 stop17h 30m

£349

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 29/9

19:00-14:35

1 stop11h 35m

London Gatwick

Mon 6/10

15:40-20:40

1 stop13h 00m

£355

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 6/10

15:45-14:35

1 stop14h 50m

London Gatwick

Sun 19/10

15:40-17:50

1 stop34h 10m

£355

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 21/9

11:11-09:40

1 stop14h 29m

London Heathrow

Tue 30/9

12:20-21:15

1 stop16h 55m

£357

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/9

07:15-09:35

1 stop18h 20m

London Heathrow

Wed 17/9

06:55-16:59

1 stop18h 04m

£358

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/9

07:15-09:35

1 stop18h 20m

London Heathrow

Wed 17/9

08:40-18:36

2 stops17h 56m

£360

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 14/9

07:15-06:30

1 stop15h 15m

London Heathrow

Tue 14/10

14:10-22:26

1 stop16h 16m

£363

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 5/10

09:55-11:50

2 stops17h 55m

London Heathrow

Tue 21/10

14:10-18:46

1 stop12h 36m

£382

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 27/8

13:55-11:45

1 stop13h 50m

London Heathrow

Wed 3/9

09:00-16:59

1 stop15h 59m

£383

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from State of Washington to London

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to London?

The cheapest month to fly to London from State of Washington is in October. Flight prices, which tend to average around £490, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from State of Washington averaging around £497.

What is the cheapest day to depart on your flight to London?

Our data shows that Tuesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £500. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from State of Washington to London for around £723.

What is the cheapest time of day to depart on your flight to London?

The cheapest time of day to fly to London is at midday when flights can be purchased for as low as £590. Flights in the morning are often more expensive, with an average ticket price of £1,009.

What is the cheapest Washington to London flight route?

Fly from Seattle/Tacoma Intl to London Heathrow for the best Washington - London flight prices

How far in advance should I book a flight to London?

You are more likely to see cheaper flights to London from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £593 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from State of Washington for as low as £517 on momondo.

What cabin class options are available on Washington to London flights?

There are 3 cabin classes available to choose from on Washington to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on State of Washington to London flights?

You could potentially save up to 70% on your flight if you consider stops on a State of Washington to London flight.

Cheap State of Washington to London flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to London

Best price found	£159
Fastest flight time	9h 30m
Direct flights	Every day
Airports in London	5 airports

The best one-way flight to London from State of Washington in the past 72 hours is £159. The best return flight deal from State of Washington to London found on momondo in the last 72 hours is £347.

The fastest flight from State of Washington to London takes 9h 30m

Direct flights go from State of Washington to London every day.

There are 5 airports near London: London City (LCY), London Heathrow (LHR), London Luton (LTN), London Stansted (STN), London Gatwick (LGW)

Search flight deals

When did momondo last update prices for flights from Washington to London?
Prices for flights from Washington to London were last updated today.
How many operators does momondo search for flights from Washington to London?
As of August 2025, there are 4 operators available to choose from for flights from Washington to London.
How old do you have to be to fly from Washington to London?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to London.
What documentation or ID do you need to fly to London?
The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from State of Washington to London?
momondo data reveals that the most frequently booked plane model on the route from State of Washington to London is Boeing 787-10 Dreamliner, representing 33.66% of all bookings. The subsequent popular models are Airbus A330-900neo at 20.70%, Boeing 777-300 at 12.83%, and Boeing 787-9 Dreamliner at 9.37%.

Best airlines flying from State of Washington to London

Compare and see reviews for airlines that fly from State of Washington to London with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom £349	Free Cancellation	Rating 6.6 7,267 reviews	Search British Airways flights
Icelandair	PriceFrom £357	Free Cancellation	Rating 7.0 526 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom £401	Free Cancellation	Rating 7.4 657 reviews	Search Virgin Atlantic flights

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Chelmsford

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Why use momondo?

Why should I use momondo to find a flight deal from Washington to London?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington to London . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Washington to London with flexible booking policies on momondo?

All flight searches from Washington to London on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Washington to London?

Once you have performed a search for Washington to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Washington to London right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Washington to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.