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Cheap flights from London Heathrow Airport to Washington from £400

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Washington departing on 4/12. 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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0 bags

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Cheap return flights

Enter your travel dates to find the best prices.
Austrian Airlines Logo
07:55 - 18:52LHR-SEA
18h 57m1 stop
Austrian Airlines Logo
08:00 - 11:15SEA-LHR
19h 15m2 stops
£440Austrian Airlines
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Mon, 10 Nov - Tue, 18 Nov
United Airlines Logo
06:50 - 20:54LHR-SEA
22h 04m2 stops
United Airlines Logo
19:13 - 09:40SEA-LHR
30h 27m1 stop
£441United Airlines
Find Deal
Thu, 27 Nov - Mon, 1 Dec
Virgin Atlantic Logo
12:20 - 15:45LHR-SEA
10h 25mdirect
Virgin Atlantic Logo
11:15 - 10:00SEA-LHR
14h 45m1 stop
£442Virgin Atlantic
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Wed, 29 Oct - Mon, 3 Nov
United Airlines Logo
06:30 - 11:55LHR-SEA
13h 25m1 stop
United Airlines Logo
08:00 - 06:40SEA-LHR
14h 40m1 stop
£443United Airlines
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Tue, 21 Oct - Mon, 3 Nov
Icelandair Logo
12:15 - 17:00LHR-SEA
12h 45m1 stop
Icelandair Logo
15:45 - 11:55SEA-LHR
12h 10m1 stop
£444Icelandair
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Wed, 5 Nov - Fri, 3 Apr
Icelandair Logo
12:15 - 17:00LHR-SEA
12h 45m1 stop
Icelandair Logo
19:00 - 20:20SEA-LHR
17h 20m1 stop
£445Icelandair
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Wed, 5 Nov - Fri, 3 Apr
British Airways Logo
09:25 - 12:30LHR-SEA
10h 05mdirect
British Airways Logo
10:01 - 06:50SEA-LHR
13h 49m1 stop
£446British Airways
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Tue, 10 Mar - Tue, 17 Mar
Virgin Atlantic Logo
19:20 - 11:25LHR-SEA
24h 05m1 stop
Virgin Atlantic Logo
19:20 - 12:50SEA-LHR
9h 30mdirect
£447Virgin Atlantic
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Mon, 3 Nov - Mon, 17 Nov
British Airways Logo
14:55 - 17:55LHR-SEA
10h 00mdirect
British Airways Logo
14:25 - 07:00SEA-LHR
9h 35mdirect
£450British Airways
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Tue, 10 Mar - Tue, 17 Mar
Air France Logo
12:20 - 15:45LHR-SEA
10h 25mdirect
Air France Logo
16:48 - 10:30SEA-LHR
9h 42mdirect
£473Air France
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Tue, 28 Oct - Tue, 4 Nov

United Airlines flights from London Heathrow Airport to State of Washington

Our best United Airlines deals on London Heathrow Airport to State of Washington flight tickets
United Airlines
27 Nov
LHR06:50London Heathrow
22h 04m
2 stops
SEA20:54Seattle/Tacoma Intl
1 Dec
SEA19:13Seattle/Tacoma Intl
30h 27m
1 stop
LHR09:40London Heathrow
£441
Find similar
United Airlines
21 Oct
LHR06:30London Heathrow
13h 25m
1 stop
SEA11:55Seattle/Tacoma Intl
3 Nov
SEA08:00Seattle/Tacoma Intl
14h 40m
1 stop
LHR06:40London Heathrow
£443
Find similar
United Airlines
30 Oct
LHR09:30London Heathrow
34h 40m
1 stop
SEA13:10Seattle/Tacoma Intl
4 Nov
SEA08:00Seattle/Tacoma Intl
42h 15m
2 stops
LHR10:15London Heathrow
£455
Find similar

Virgin Atlantic flights from London Heathrow Airport to State of Washington

Our best Virgin Atlantic deals on London Heathrow Airport to State of Washington flight tickets
Virgin Atlantic
29 Oct
LHR12:20London Heathrow
10h 25m
SEA15:45Seattle/Tacoma Intl
3 Nov
SEA11:15Seattle/Tacoma Intl
14h 45m
1 stop
LHR10:00London Heathrow
£442
Find similar
Virgin Atlantic
3 Nov
LHR19:20London Heathrow
24h 05m
1 stop
SEA11:25Seattle/Tacoma Intl
17 Nov
SEA19:20Seattle/Tacoma Intl
9h 30m
LHR12:50London Heathrow
£447
Find similar
Virgin Atlantic
3 Nov
LHR14:45London Heathrow
10h 05m
SEA16:50Seattle/Tacoma Intl
17 Nov
SEA19:20Seattle/Tacoma Intl
9h 30m
LHR12:50London Heathrow
£449
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport to State of Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 3 October 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 10/11

07:55-18:52

1 stop18h 57m

Seattle/Tacoma Intl

Tue 18/11

08:00-11:15

2 stops19h 15m

£440

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 27/11

06:50-20:54

2 stops22h 04m

Seattle/Tacoma Intl

Mon 1/12

19:13-09:40

1 stop30h 27m

£441

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 29/10

12:20-15:45

Nonstop10h 25m

Seattle/Tacoma Intl

Mon 3/11

11:15-10:00

1 stop14h 45m

£442

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 21/10

06:30-11:55

1 stop13h 25m

Seattle/Tacoma Intl

Mon 3/11

08:00-06:40

1 stop14h 40m

£443

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 5/11

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Fri 3/4

15:45-11:55

1 stop12h 10m

£444

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 5/11

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Fri 3/4

19:00-20:20

1 stop17h 20m

£445

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/3

09:25-12:30

Nonstop10h 05m

Seattle/Tacoma Intl

Tue 17/3

10:01-06:50

1 stop13h 49m

£446

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/11

19:20-11:25

1 stop24h 05m

Seattle/Tacoma Intl

Mon 17/11

19:20-12:50

Nonstop9h 30m

£447

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/3

14:55-17:55

Nonstop10h 00m

Seattle/Tacoma Intl

Tue 17/3

14:25-07:00

Nonstop9h 35m

£450

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 28/10

12:20-15:45

Nonstop10h 25m

Seattle/Tacoma Intl

Tue 4/11

16:48-10:30

Nonstop9h 42m

£473

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington from

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

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 State of Washington?

If you aren’t able to travel to State of Washington during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of £509.

What is the cheapest day to depart on your flight to State of Washington?

The cheapest day to depart from London Heathrow Airport to State of Washington is on a Wednesday. Travellers who choose to depart for State of Washington on a Wednesday will often find tickets for as low as £590. 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 State of Washington on Sunday is £690.

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

Flying to State of Washington from London Heathrow Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as £518 when looking at flights departing in the evening. In contrast, the most expensive time of day to depart to State of Washington is in the afternoon when prices are around £627.

What is the cheapest London Heathrow to Washington flight route?

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

How far in advance should I book a flight to State of Washington?

You are more likely to see cheaper flights to State of Washington from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around £570 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from London Heathrow Airport for as low as £515 on momondo.

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

There are 4 cabin classes available to choose from on London Heathrow to Washington 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 London Heathrow Airport to State of Washington flights?

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to State of Washington.

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

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

Best price found

£564

Fastest flight time

9h 45m

Direct flights

Every day

Airports in State of Washington

2 airports
The best one-way flight to State of Washington from London Heathrow Airport in the past 72 hours is £564. The best return flight deal from London Heathrow Airport to State of Washington found on momondo in the last 72 hours is £496.
The fastest flight from London Heathrow Airport to State of Washington takes 9h 45m
Direct flights go from London Heathrow Airport to State of Washington every day.
There are 2 airports near State of Washington: Portland (PDX), Seattle/Tacoma Intl (SEA)
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  • When did momondo last update prices for flights from London Heathrow Airport to Washington?

    Prices for flights from London Heathrow Airport to Washington refresh daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Washington.

  • What documentation or ID do you need to fly to Washington?

    The necessary travel and health documents for your Washington trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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

Best airlines flying from London Heathrow Airport to State of Washington

Compare and see reviews for airlines that fly from London Heathrow Airport to State of Washington with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom £354Free CancellationRating
7.0
546 reviews
Search Icelandair flights
Air FrancePriceFrom £383Free CancellationRating
7.4
1,467 reviews
Search Air France flights
LufthansaPriceFrom £394Free CancellationRating
6.8
7,444 reviews
Search Lufthansa flights
FinnairPriceFrom £397Free CancellationRating
7.6
1,332 reviews
Search Finnair flights
KLMPriceFrom £404Free CancellationRating
7.8
1,389 reviews
Search KLM flights
United AirlinesPriceFrom £404Free CancellationRating
7.4
8,933 reviews
Search United Airlines flights
Aer LingusPriceFrom £405Free CancellationRating
7.2
1,309 reviews
Search Aer Lingus flights
British AirwaysPriceFrom £433Free CancellationRating
6.7
7,415 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £441Free CancellationRating
7.4
665 reviews
Search Virgin Atlantic flights
DeltaPriceFrom £443Free CancellationRating
7.9
7,962 reviews
Search Delta flights

Why use momondo?

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

It is quick and easy to find London to Washington flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Washington that suits you.

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

Yes. momondo allows you to filter the results for London to Washington flights to just show those with flexible booking policies.

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

Once you have performed a search for London to Washington 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 London to Washington right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Washington flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your State of Washington trip

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