What airlines fly to London?

British Airways, Delta and Virgin Atlantic are the top three most popular airlines that fly to London from State of Washington according to our data. British Airways is the first choice among our users, with 36% of people opting to fly with this airline when traveling to London. Keep in mind that there are 14 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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 195 per week as of September 2025. The most frequent departure day is Mon, with 17% 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 27 per day as of September 2025. The most frequent departure time is 8:00PM, with 52% of daily flights leaving in the evening.

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

WestJet, JetBlue, and Icelandair are the most popular carriers operating from Washington to London

How long does it take to fly to London?

If you’re flying from a popular airport in State of Washington, such as Seattle or Spokane, and flying into London, then you can expect flight times to average 9h 20m and 12h 02m, respectively.

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

Prices for flights from Washington to London are refreshed on a daily basis.

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

There are 15 operators available for flights from Washington to London as of September 2025.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify 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.

$310 Cheap Flights from Washington to London in 2025/26

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Find the cheapest flights from Washington to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

2:35 pm - 10:55 amSEA-LGW

12h 20m1 stop

11:55 am - 5:00 pmLGW-SEA

13h 05m1 stop

$509Icelandair

Find Deal

Sat, Feb 14 - Sun, Feb 22

2:35 pm - 7:30 pmSEA-LHR

20h 55m1 stop

12:15 pm - 5:00 pmLHR-SEA

12h 45m1 stop

$509Icelandair

Find Deal

Wed, Nov 5 - Wed, Nov 19

3:45 pm - 8:55 pmSEA-STN

21h 10m2 stops

8:15 am - 5:50 pmSTN-SEA

17h 35m2 stops

$510Multiple Airlines

Find Deal

Wed, Oct 15 - Wed, Oct 22

2:35 pm - 2:15 pmSEA-STN

15h 40m2 stops

8:05 am - 5:00 pmSTN-SEA

16h 55m2 stops

$512Multiple Airlines

Find Deal

Thu, Nov 6 - Thu, Nov 13

5:50 am - 7:10 amSEA-LHR

17h 20m2 stops

1:25 pm - 9:31 amLHR-SEA

28h 06m2 stops

$518Air Canada

Find Deal

Wed, Nov 12 - Thu, Nov 20

10:05 am - 11:50 amSEA-LHR

17h 45m1 stop

1:25 pm - 10:45 pmLHR-SEA

41h 20m2 stops

$555United Airlines

Find Deal

Thu, Nov 6 - Thu, Nov 13

2:10 pm - 5:40 pmSEA-LHR

19h 30m2 stops

7:30 pm - 2:00 pmLHR-SEA

26h 30m1 stop

$559Scandinavian Airlines

Find Deal

Wed, Oct 8 - Thu, Oct 23

12:45 pm - 5:40 pmSEA-LHR

20h 55m2 stops

7:30 pm - 2:00 pmLHR-SEA

26h 30m1 stop

$562Scandinavian Airlines

Find Deal

Tue, Oct 14 - Thu, Oct 23

3:15 pm - 11:50 amPDX-LHR

12h 35m1 stop

11:35 am - 9:26 pmLHR-PDX

17h 51m1 stop

$573United Airlines

Find Deal

Wed, Nov 5 - Wed, Nov 12

3:25 pm - 1:20 pmPDX-LHR

13h 55m1 stop

2:30 pm - 9:15 amLHR-PDX

26h 45m1 stop

$578Air Canada

Find Deal

Mon, Oct 20 - Wed, Nov 5

Air Canada flights from State of Washington to London

Our best Air Canada deals on State of Washington to London flight tickets

Air Canada

Nov 12

SEA5:50 amSeattle/Tacoma Intl

17h 20m

2 stops

LHR7:10 amLondon Heathrow

Nov 20

LHR1:25 pmLondon Heathrow

28h 06m

2 stops

SEA9:31 amSeattle/Tacoma Intl

$518

Find similar

Air Canada

Oct 20

PDX3:25 pmPortland

13h 55m

1 stop

LHR1:20 pmLondon Heathrow

Nov 5

LHR2:30 pmLondon Heathrow

26h 45m

1 stop

PDX9:15 amPortland

$578

Find similar

Air Canada

Nov 5

PDX9:50 amPortland

18h 00m

1 stop

LHR11:50 amLondon Heathrow

Nov 12

LHR11:10 amLondon Heathrow

19h 25m

2 stops

PDX10:35 pmPortland

$579

Find similar

Icelandair flights from State of Washington to London

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

Icelandair

Nov 5

SEA2:35 pmSeattle/Tacoma Intl

20h 55m

1 stop

LHR7:30 pmLondon Heathrow

Nov 19

LHR12:15 pmLondon Heathrow

12h 45m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$509

Find similar

Icelandair

Nov 9

SEA2:35 pmSeattle/Tacoma Intl

12h 20m

1 stop

LGW10:55 amLondon Gatwick

Nov 19

LGW11:55 amLondon Gatwick

13h 05m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$510

Find similar

Icelandair

Nov 12

SEA2:35 pmSeattle/Tacoma Intl

12h 15m

1 stop

LHR10:50 amLondon Heathrow

Nov 19

LHR12:15 pmLondon Heathrow

12h 45m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$511

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sat 2/14

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Sun 2/22

11:55 am-5:00 pm

1 stop13h 05m

$509

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 11/5

2:35 pm-7:30 pm

1 stop20h 55m

London Heathrow

Wed 11/19

12:15 pm-5:00 pm

1 stop12h 45m

$509

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 10/15

3:45 pm-8:55 pm

2 stops21h 10m

London Stansted

Wed 10/22

8:15 am-5:50 pm

2 stops17h 35m

$510

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Thu 11/6

2:35 pm-2:15 pm

2 stops15h 40m

London Stansted

Thu 11/13

8:05 am-5:00 pm

2 stops16h 55m

$512

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 11/12

5:50 am-7:10 am

2 stops17h 20m

London Heathrow

Thu 11/20

1:25 pm-9:31 am

2 stops28h 06m

$518

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 11/6

10:05 am-11:50 am

1 stop17h 45m

London Heathrow

Thu 11/13

1:25 pm-10:45 pm

2 stops41h 20m

$555

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/8

2:10 pm-5:40 pm

2 stops19h 30m

London Heathrow

Thu 10/23

7:30 pm-2:00 pm

1 stop26h 30m

$559

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/14

12:45 pm-5:40 pm

2 stops20h 55m

London Heathrow

Thu 10/23

7:30 pm-2:00 pm

1 stop26h 30m

$562

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 11/5

3:15 pm-11:50 am

1 stop12h 35m

London Heathrow

Wed 11/12

11:35 am-9:26 pm

1 stop17h 51m

$573

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 10/20

3:25 pm-1:20 pm

1 stop13h 55m

London Heathrow

Wed 11/5

2:30 pm-9:15 am

1 stop26h 45m

$578

Flights are sorted by cheapest round-trip 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 $648, 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 $674.

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

The cheapest day to depart from State of Washington to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $813. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $916. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from State of Washington in the evening is the least expensive time of day to depart. momondo users have found prices as low as $842 when looking at flights departing in the evening. Flights to London are more costly in the morning, with an average ticket price of $980. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $801 when searching weeks out. 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 $705 on momondo.

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

There are 4 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 34% 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	$407
Fastest flight time	9h 20m
Direct flights	Every day
Airports in London	1 airport

The best one-way flight to London from State of Washington in the past 72 hours is $407. The best round-trip flight deal from State of Washington to London found on momondo in the last 72 hours is $657.

The fastest flight from State of Washington to London takes 9h 20m

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

There is 1 airport near London: London Heathrow (LHR)

Search flight deals

When did momondo last update prices for flights from Washington to London?
Prices for flights from Washington to London are refreshed on a daily basis.
How many operators does momondo search for flights from Washington to London?
There are 15 operators available for flights from Washington to London as of September 2025.
How old do you have to be to fly from Washington to London?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify 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 30.49% of all bookings. The subsequent popular models are Airbus A330-900neo at 20.53%, Airbus A330-200 at 12.19%, and Boeing 787-9 Dreamliner at 12.00%.

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
Lufthansa	PriceFrom $378	Free Cancellation	Rating 6.8 7,421 reviews	Search Lufthansa flights
Icelandair	PriceFrom $484	Free Cancellation	Rating 7.0 545 reviews	Search Icelandair flights
Air France	PriceFrom $517	Free Cancellation	Rating 7.4 1,466 reviews	Search Air France flights
Aer Lingus	PriceFrom $523	Free Cancellation	Rating 7.2 1,296 reviews	Search Aer Lingus flights
Scandinavian Airlines	PriceFrom $532	Free Cancellation	Rating 7.4 1,492 reviews	Search Scandinavian Airlines flights
United Airlines	PriceFrom $550	Free Cancellation	Rating 7.4 8,926 reviews	Search United Airlines flights
British Airways	PriceFrom $552	Free Cancellation	Rating 6.7 7,391 reviews	Search British Airways flights
Finnair	PriceFrom $556	Free Cancellation	Rating 7.6 1,326 reviews	Search Finnair flights
Delta	PriceFrom $561	Free Cancellation	Rating 7.9 7,974 reviews	Search Delta flights
American Airlines	PriceFrom $568	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights

Gatwick

Hounslow

Dover

Luton

Slough

Milton Keynes

Hayes

Guildford

Dartford

Crawley

Stansted

Chelmsford

Brentwood

Ilford

Folkestone

Colchester

Watford

Wembley

Richmond

Croydon

Why use momondo?

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

Finding the right flight to London from Washington is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to London from Washington with this policy.

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

momondo provides multiple filters to help you find the best flight to London from Washington. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Washington and alert you when they change.

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Popular cities in the United Kingdom

Flights to Manchesterfrom $381

Flights to Edinburghfrom $404

Flights to Glasgowfrom $389

Flights to Birminghamfrom $392

Flights to Newcastle upon Tynefrom $430

Flights to Belfastfrom $469

Flights to Bristolfrom $461

Flights to Invernessfrom $455

Flights to Liverpoolfrom $415

Flights to Aberdeenfrom $486

Flights to Leedsfrom $445

Flights to Cardifffrom $490

Cheap flights from Washington to London from $310

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to London departing on 10/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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Filter for what you want

Trusted and free

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Find the cheapest flights from Washington to London

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Air Canada flights from State of Washington to London

Our best Air Canada deals on State of Washington to London flight tickets

Icelandair flights from State of Washington to London

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

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See travel insights to London from

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

What is the cheapest month to fly to London?

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

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

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?

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

There are 4 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 34% on your flight if you consider stops on a State of Washington to London flight.

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

WestJet, JetBlue, and Icelandair are the most popular carriers operating from Washington to London

What airlines fly to London?

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 27 per day as of September 2025. The most frequent departure time is 8:00PM, with 52% of daily flights leaving in the evening.

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 195 per week as of September 2025. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.

How long does it take to fly to London?

If you’re flying from a popular airport in State of Washington, such as Seattle or Spokane, and flying into London, then you can expect flight times to average 9h 20m and 12h 02m, respectively.

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

Fastest flight time

Direct flights

Airports in London

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

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

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

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

What is the most popular plane model from State of Washington to London?

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

Traveling to a place near London?

Why use momondo?

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

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

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

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

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London