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

On average, it takes 9h 15m to fly from State of Washington to London Heathrow Airport if you fly out of Seattle (the most popular airport in State of Washington) and into London Heathrow Airport (the most popular airport in London Heathrow Airport). If you’re flying out of Pasco and into London Heathrow Airport, then the flight time is around 12h 37m.

What airlines fly to London Heathrow Airport?

British Airways, Delta and Virgin Atlantic are the top three most popular airlines that fly to London Heathrow Airport from State of Washington according to our data. British Airways is the first choice among our users, with 37% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 14 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

Icelandair, WestJet, and Aer Lingus 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 are refreshed on a daily basis.

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

As of December 2025, there are 15 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?

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 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.

$292 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 week?

The number of flights available between State of Washington and London Heathrow Airport is 104 per week as of December 2025. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.

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 14 per day as of December 2025. The most frequent departure time is 4:00PM, with 60% of daily flights leaving in the afternoon.

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Cheap round-trip flights

Enter your travel dates to find the best prices.

3:40 pm - 11:55 am

SEA

LHR

12h 15m1 stop

1:05 pm - 5:55 pm

LHR

SEA

12h 50m1 stop

$575Icelandair

Thu, Apr 9 - Fri, Apr 24

2:35 pm - 8:05 pm

SEA

LHR

21h 30m2 stops

8:50 pm - 5:00 pm

LHR

SEA

28h 10m2 stops

$577Multiple Airlines

Wed, Jan 14 - Mon, Jan 19

3:40 pm - 11:55 am

SEA

LHR

12h 15m1 stop

1:05 pm - 8:40 pm

LHR

SEA

15h 35m1 stop

$578Icelandair

Mon, Apr 6 - Thu, May 7

2:10 pm - 11:15 am

SEA

LHR

13h 05m1 stop

6:30 am - 12:10 pm

LHR

SEA

13h 40m1 stop

$583Lufthansa

Thu, Jan 22 - Thu, Jan 29

9:55 am - 10:10 am

SEA

LHR

16h 15m2 stops

6:35 am - 1:20 pm

LHR

SEA

14h 45m1 stop

$584Lufthansa

Fri, Jan 23 - Fri, Jan 30

3:40 pm - 11:50 am

SEA

LHR

12h 10m1 stop

6:35 am - 7:16 pm

LHR

SEA

20h 41m2 stops

$585Lufthansa

Fri, Jan 23 - Fri, Jan 30

5:05 am - 10:30 am

PSC

LHR

21h 25m1 stop

6:30 am - 7:56 pm

LHR

PSC

21h 26m2 stops

$629KLM

Thu, Jan 22 - Thu, Jan 29

11:35 am - 10:00 am

PSC

LHR

14h 25m1 stop

6:30 am - 11:03 pm

LHR

PSC

24h 33m2 stops

$630Delta

Fri, Feb 6 - Fri, Feb 13

5:05 am - 10:30 am

PSC

LHR

21h 25m1 stop

6:30 am - 4:16 pm

LHR

PSC

17h 46m2 stops

$631KLM

Wed, Feb 25 - Wed, Mar 4

6:00 am - 6:20 am

PSC

LHR

16h 20m2 stops

6:30 am - 11:03 pm

LHR

PSC

24h 33m2 stops

$635Delta

Wed, Feb 25 - Wed, Mar 4

Delta flights from State of Washington to London Heathrow Airport

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

Delta

Jan 20

SEA4:45 pmSeattle/Tacoma Intl

9h 45m

LHR10:30 amLondon Heathrow

Feb 2

LHR8:40 amLondon Heathrow

35h 00m

1 stop

SEA11:40 amSeattle/Tacoma Intl

$615

Find similar

Delta

Feb 9

SEA4:55 pmSeattle/Tacoma Intl

9h 35m

LHR10:30 amLondon Heathrow

Mar 1

LHR8:40 amLondon Heathrow

34h 55m

1 stop

SEA11:35 amSeattle/Tacoma Intl

$616

Find similar

Delta

Jan 22

SEA6:05 amSeattle/Tacoma Intl

18h 40m

1 stop

LHR8:45 amLondon Heathrow

Feb 4

LHR6:30 amLondon Heathrow

13h 10m

1 stop

SEA11:40 amSeattle/Tacoma Intl

$617

Find similar

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

Jan 22

PSC5:05 amPasco Tri Cities

21h 25m

1 stop

LHR10:30 amLondon Heathrow

Jan 29

LHR6:30 amLondon Heathrow

21h 26m

2 stops

PSC7:56 pmPasco Tri Cities

$629

Find similar

KLM

Feb 25

PSC5:05 amPasco Tri Cities

21h 25m

1 stop

LHR10:30 amLondon Heathrow

Mar 4

LHR6:30 amLondon Heathrow

17h 46m

2 stops

PSC4:16 pmPasco Tri Cities

$631

Find similar

KLM

Mar 5

GEG11:20 amSpokane

15h 10m

1 stop

LHR10:30 amLondon Heathrow

Mar 14

LHR3:05 pmLondon Heathrow

12h 59m

1 stop

GEG9:04 pmSpokane

$658

Find similar

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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Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 4/9

3:40 pm-11:55 am

1 stop12h 15m

London Heathrow

Fri 4/24

1:05 pm-5:55 pm

1 stop12h 50m

$575

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 1/14

2:35 pm-8:05 pm

2 stops21h 30m

London Heathrow

Mon 1/19

8:50 pm-5:00 pm

2 stops28h 10m

$577

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 4/6

3:40 pm-11:55 am

1 stop12h 15m

London Heathrow

Thu 5/7

1:05 pm-8:40 pm

1 stop15h 35m

$578

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 1/22

2:10 pm-11:15 am

1 stop13h 05m

London Heathrow

Thu 1/29

6:30 am-12:10 pm

1 stop13h 40m

$583

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 1/23

9:55 am-10:10 am

2 stops16h 15m

London Heathrow

Fri 1/30

6:35 am-1:20 pm

1 stop14h 45m

$584

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 1/23

3:40 pm-11:50 am

1 stop12h 10m

London Heathrow

Fri 1/30

6:35 am-7:16 pm

2 stops20h 41m

$585

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Thu 1/22

5:05 am-10:30 am

1 stop21h 25m

London Heathrow

Thu 1/29

6:30 am-7:56 pm

2 stops21h 26m

$629

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Fri 2/6

11:35 am-10:00 am

1 stop14h 25m

London Heathrow

Fri 2/13

6:30 am-11:03 pm

2 stops24h 33m

$630

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Wed 2/25

5:05 am-10:30 am

1 stop21h 25m

London Heathrow

Wed 3/4

6:30 am-4:16 pm

2 stops17h 46m

$631

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Wed 2/25

6:00 am-6:20 am

2 stops16h 20m

London Heathrow

Wed 3/4

6:30 am-11:03 pm

2 stops24h 33m

$635

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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?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from State of Washington, with most prices found around $662. If you’re not able to fly to London Heathrow Airport in October, then March is your next best option. Flight prices from State of Washington to London Heathrow Airport during March average around $684.

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

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $787. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $884.

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 in the evening. momondo users have found flights departing from State of Washington to London Heathrow Airport in the evening for as low as $831. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $987.

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 $794 when searching weeks out. 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 $692 on momondo.

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

There are 4 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 38% 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	$383
Fastest flight time	9h 25m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from State of Washington in the past 72 hours is $383. The best round-trip flight deal from State of Washington to London Heathrow Airport found on momondo in the last 72 hours is $633.

The fastest flight from State of Washington to London Heathrow Airport takes 9h 25m

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 are refreshed on a daily basis.
How many operators does momondo search for flights from Washington to London Heathrow Airport?
As of December 2025, there are 15 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?
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 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
Scandinavian Airlines	PriceFrom $465	Free Cancellation	Rating 7.4 1,627 reviews	Search Scandinavian Airlines flights
Icelandair	PriceFrom $481	Free Cancellation	Rating 7.0 592 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $500	Free Cancellation	Rating 7.2 1,412 reviews	Search Aer Lingus flights
American Airlines	PriceFrom $517	Free Cancellation	Rating 7.2 11,065 reviews	Search American Airlines flights
Air France	PriceFrom $532	Free Cancellation	Rating 7.4 1,515 reviews	Search Air France flights
British Airways	PriceFrom $544	Free Cancellation	Rating 6.7 7,617 reviews	Search British Airways flights
United Airlines	PriceFrom $547	Free Cancellation	Rating 7.4 9,116 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $553	Free Cancellation	Rating 8.0 11,540 reviews	Search Alaska Airlines flights
Finnair	PriceFrom $556	Free Cancellation	Rating 7.6 1,339 reviews	Search Finnair flights
Delta	PriceFrom $563	Free Cancellation	Rating 7.9 8,016 reviews	Search Delta flights

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Crawley

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Wembley

Cobham

Folkestone

Romford

Richmond

Uxbridge

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

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Cheap flights from Washington to London from $292

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 1/26. 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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Delta flights from State of Washington to London Heathrow Airport

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

KLM flights from State of Washington to London Heathrow Airport

Our best KLM 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?

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $787. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $884.

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 4 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 38% 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?

Icelandair, WestJet, and Aer Lingus are the most popular carriers operating from Washington to London Heathrow

What airlines fly to London Heathrow Airport?

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 14 per day as of December 2025. The most frequent departure time is 4:00PM, 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?

The number of flights available between State of Washington and London Heathrow Airport is 104 per week as of December 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 Heathrow Airport?

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

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 Heathrow Airport 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 London

Popular cities in the United Kingdom

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