How long does it take to fly to London Heathrow Airport?

If you’re flying from a popular airport in State of Washington, such as Seattle or Pasco, and flying into London Heathrow Airport, then you can expect flight times to average 9h 15m and 12h 37m, respectively.

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

WestJet, Lufthansa, and Air Canada are the most popular carriers operating from Washington to London Heathrow

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

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

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

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

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

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 Heathrow Airport.

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

The travel and health documents you'll need for your trip to London Heathrow Airport 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 Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

£215 Cheap Flights from State of Washington to London Heathrow Airport in 2025/26

Q: How many flights depart from State of Washington to London Heathrow Airport on average per day?

The number of flights available between State of Washington and London Heathrow Airport is 17 per day as of December 2025. The most frequent departure time is 16:00, with 60% of daily flights leaving in the afternoon.

Q: How many flights depart from State of Washington to London Heathrow Airport on average per week?

As of December 2025, 122 flights take off from State of Washington and land in London Heathrow Airport each week. The most common flight departure day for this route is Fri, with 20% of weekly flights taking off on this day.

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15:40 - 11:55

SEA

LHR

12h 15m1 stop

13:05 - 17:55

LHR

SEA

12h 50m1 stop

£426Icelandair

Thu, 9 Apr - Fri, 24 Apr

14:35 - 20:05

SEA

LHR

21h 30m2 stops

20:50 - 17:00

LHR

SEA

28h 10m2 stops

£427Multiple Airlines

Wed, 14 Jan - Mon, 19 Jan

15:40 - 11:55

SEA

LHR

12h 15m1 stop

13:05 - 20:40

LHR

SEA

15h 35m1 stop

£428Icelandair

Mon, 6 Apr - Thu, 7 May

14:10 - 11:15

SEA

LHR

13h 05m1 stop

06:30 - 12:10

LHR

SEA

13h 40m1 stop

£431Lufthansa

Thu, 22 Jan - Thu, 29 Jan

09:55 - 10:10

SEA

LHR

16h 15m2 stops

06:35 - 13:20

LHR

SEA

14h 45m1 stop

£432Lufthansa

Fri, 23 Jan - Fri, 30 Jan

09:55 - 11:50

SEA

LHR

17h 55m1 stop

06:35 - 19:16

LHR

SEA

20h 41m2 stops

£433Lufthansa

Fri, 23 Jan - Fri, 30 Jan

05:05 - 10:30

PSC

LHR

21h 25m1 stop

06:30 - 19:56

LHR

PSC

21h 26m2 stops

£465KLM

Thu, 22 Jan - Thu, 29 Jan

11:35 - 10:00

PSC

LHR

14h 25m1 stop

06:30 - 23:03

LHR

PSC

24h 33m2 stops

£466Delta

Fri, 6 Feb - Fri, 13 Feb

13:20 - 11:55

GEG

LHR

14h 35m1 stop

08:40 - 19:57

LHR

GEG

19h 17m2 stops

£466Delta

Sat, 7 Feb - Sat, 14 Feb

11:35 - 10:00

PSC

LHR

14h 25m1 stop

06:30 - 20:04

LHR

PSC

21h 34m2 stops

£467KLM

Sat, 7 Feb - Sat, 14 Feb

KLM flights from State of Washington to London Heathrow Airport

Our best KLM deals on State of Washington to London Heathrow Airport flight tickets

KLM

20 Jan

SEA16:45Seattle/Tacoma Intl

9h 45m

LHR10:30London Heathrow

3 Feb

LHR06:30London Heathrow

13h 10m

1 stop

SEA11:40Seattle/Tacoma Intl

£455

Find similar

KLM

22 Jan

PSC05:05Pasco Tri Cities

21h 25m

1 stop

LHR10:30London Heathrow

29 Jan

LHR06:30London Heathrow

21h 26m

2 stops

PSC19:56Pasco Tri Cities

£465

Find similar

KLM

7 Feb

PSC11:35Pasco Tri Cities

14h 25m

1 stop

LHR10:00London Heathrow

14 Feb

LHR06:30London Heathrow

21h 34m

2 stops

PSC20:04Pasco Tri Cities

£467

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Virgin Atlantic flights from State of Washington to London Heathrow Airport

Our best Virgin Atlantic deals on State of Washington to London Heathrow Airport flight tickets

Virgin Atlantic

22 Jan

PSC06:50Pasco Tri Cities

17h 55m

2 stops

LHR08:45London Heathrow

29 Jan

LHR08:40London Heathrow

19h 16m

2 stops

PSC19:56Pasco Tri Cities

£469

Find similar

Virgin Atlantic

7 Jan

SEA15:30Seattle/Tacoma Intl

17h 20m

1 stop

LHR16:50London Heathrow

14 Jan

LHR12:20London Heathrow

10h 29m

SEA14:49Seattle/Tacoma Intl

£553

Find similar

Virgin Atlantic

7 Jan

SEA16:45Seattle/Tacoma Intl

9h 45m

LHR10:30London Heathrow

14 Jan

LHR12:20London Heathrow

10h 29m

SEA14:49Seattle/Tacoma Intl

£586

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momondo Fare Finder

Use the filters below to find and compare flights from Washington to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 9/4

15:40-11:55

1 stop12h 15m

London Heathrow

Fri 24/4

13:05-17:55

1 stop12h 50m

£426

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 14/1

14:35-20:05

2 stops21h 30m

London Heathrow

Mon 19/1

20:50-17:00

2 stops28h 10m

£427

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 6/4

15:40-11:55

1 stop12h 15m

London Heathrow

Thu 7/5

13:05-20:40

1 stop15h 35m

£428

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 22/1

14:10-11:15

1 stop13h 05m

London Heathrow

Thu 29/1

06:30-12:10

1 stop13h 40m

£431

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 23/1

09:55-10:10

2 stops16h 15m

London Heathrow

Fri 30/1

06:35-13:20

1 stop14h 45m

£432

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 23/1

09:55-11:50

1 stop17h 55m

London Heathrow

Fri 30/1

06:35-19:16

2 stops20h 41m

£433

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Thu 22/1

05:05-10:30

1 stop21h 25m

London Heathrow

Thu 29/1

06:30-19:56

2 stops21h 26m

£465

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Fri 6/2

11:35-10:00

1 stop14h 25m

London Heathrow

Fri 13/2

06:30-23:03

2 stops24h 33m

£466

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 7/2

13:20-11:55

1 stop14h 35m

London Heathrow

Sat 14/2

08:40-19:57

2 stops19h 17m

£466

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Sat 7/2

11:35-10:00

1 stop14h 25m

London Heathrow

Sat 14/2

06:30-20:04

2 stops21h 34m

£467

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 Heathrow Airport

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 Heathrow Airport?

In general, October is the cheapest month to fly from State of Washington to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £490. The month of March is another great option to travel to London Heathrow Airport, with average flight prices from State of Washington averaging around £506.

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

On average, the least expensive day to fly to London Heathrow Airport from State of Washington is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £510. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £650.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is at midday. momondo users have found flights departing from State of Washington to London Heathrow Airport at midday for as low as £538. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are £624 on average. Flights to London Heathrow Airport from State of Washington in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Washington to London Heathrow flight route?

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

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

You are more likely to see cheaper flights to London Heathrow Airport from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £587 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from State of Washington for as low as £512 on momondo.

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

There are 3 cabin classes available to choose from on Washington to London Heathrow 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 Heathrow Airport flights?

You could potentially save up to 25% on your flight if you consider stops on a State of Washington to London Heathrow Airport flight.

Cheap State of Washington to London Heathrow Airport flight deals and tips

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

Best price found	£285
Fastest flight time	9h 15m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from State of Washington in the past 72 hours is £285. The best return flight deal from State of Washington to London Heathrow Airport found on momondo in the last 72 hours is £584.

The fastest flight from State of Washington to London Heathrow Airport takes 9h 15m

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

Search flight deals

When did momondo last update prices for flights from Washington to London Heathrow Airport?
Prices for flights from Washington to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Washington to London Heathrow Airport?
As of December 2025, there are 4 operators available to choose from for flights from Washington to London Heathrow Airport.
How old do you have to be to fly from Washington to London Heathrow Airport?
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 Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents you'll need for your trip to London Heathrow Airport 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 Heathrow Airport. 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 Heathrow Airport?
Based on momondo bookings for flights between State of Washington and London Heathrow Airport, the leading plane model is Boeing 787-9 Dreamliner, making up 26.11% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 24.97%, Airbus A330-200 with 20.34%, and Airbus A330-900neo with 8.42%.

Best airlines flying from State of Washington to London Heathrow Airport

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

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom £351	Free Cancellation	Rating 6.7 7,617 reviews		Search British Airways flights
Virgin Atlantic	PriceFrom £366	Free Cancellation	Rating 7.5 677 reviews		Search Virgin Atlantic flights

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Northampton

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Stratford-upon-Avon

Southend-on-Sea

Canterbury

Ipswich

Ilford

Poole

Guildford

Swanage

Hayes

Chelmsford

Dover

Worthing

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?

Flights from Washington to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Washington.

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

Yes momondo offers price alerts on flights to London from Washington. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London Heathrow Airport trip

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

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Cheap flights from Washington to London from £215

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 25/2. 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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KLM flights from State of Washington to London Heathrow Airport

Our best KLM deals on State of Washington to London Heathrow Airport flight tickets

Virgin Atlantic flights from State of Washington to London Heathrow Airport

Our best Virgin Atlantic deals on State of Washington to London Heathrow Airport flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Washington to London Heathrow Airport that are best for you.

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

What is the cheapest month to fly to London Heathrow Airport?

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

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

What is the cheapest Washington to London Heathrow flight route?

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

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

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

There are 3 cabin classes available to choose from on Washington to London Heathrow 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 Heathrow Airport flights?

You could potentially save up to 25% on your flight if you consider stops on a State of Washington to London Heathrow Airport flight.

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

WestJet, Lufthansa, and Air Canada are the most popular carriers operating from Washington to London Heathrow

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

The number of flights available between State of Washington and London Heathrow Airport is 17 per day as of December 2025. The most frequent departure time is 16:00, with 60% of daily flights leaving in the afternoon.

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

As of December 2025, 122 flights take off from State of Washington and land in London Heathrow Airport each week. The most common flight departure day for this route is Fri, with 20% of weekly flights taking off on this day.

How long does it take to fly to London Heathrow Airport?

If you’re flying from a popular airport in State of Washington, such as Seattle or Pasco, and flying into London Heathrow Airport, then you can expect flight times to average 9h 15m and 12h 37m, respectively.

Cheap State of Washington to London Heathrow Airport flight deals and tips

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

Best price found

Fastest flight time

Direct flights

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

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

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

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

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

Best airlines flying from State of Washington to London Heathrow Airport

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

Travelling 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 Heathrow Airport trip

We make it super easy to schedule, organise 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 London

Popular Cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo