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Cheap flights from London Heathrow Airport to Washington from £335

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
26 Jun — 3 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Washington

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Washington
Explore the most affordable flight options available from Heathrow to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 May 2026.

Fri 12/621:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Mon 22/619:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 25/5£533
Wed 4/1108:55
LHR
-
SEA
1 stop14h 26m
Virgin Atlantic
Sat 14/1111:25
SEA
-
LHR
1 stop14h 35m
Virgin Atlantic
Deal found 25/5£534
Mon 8/621:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Fri 19/623:25
SEA
-
LHR
1 stop28h 30m
Icelandair
Deal found 25/5£535
Sat 26/921:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Thu 22/1019:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 24/5£535
Thu 1/1006:15
LHR
-
SEA
1 stop13h 00m
Multiple Airlines
Mon 30/1113:30
SEA
-
LHR
1 stop12h 30m
Multiple Airlines
Deal found 22/5£538
Mon 22/621:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Tue 7/715:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 25/5£538
Mon 29/610:35
LHR
-
SEA
1 stop18h 18m
United Airlines
Mon 3/808:15
SEA
-
LHR
1 stop14h 40m
United Airlines
Deal found 26/5£539
Mon 31/821:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Wed 9/923:25
SEA
-
LHR
1 stop12h 55m
Icelandair
Deal found 22/5£540
Tue 1/913:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Thu 17/919:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 23/5£541
Tue 7/721:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Fri 24/715:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 22/5£541
Wed 14/1017:00
LHR
-
BLI
1 stop14h 53m
Alaska Airlines
Sun 18/1005:16
BLI
-
LHR
1 stop25h 49m
Alaska Airlines
Deal found 26/5£644
Tue 8/906:55
LHR
-
GEG
2 stops22h 19m
United Airlines
Tue 15/911:00
GEG
-
LHR
1 stop16h 55m
United Airlines
Deal found 22/5£658

Find flight deals from Heathrow to Washington

Keep the following information in mind while searching for Heathrow to Washington flight deals. Data was last updated 27 May 2026.

Round-trip from

£533

One-way from

£335

Popular in

July

Cheapest in

February

Average price

£554

Good round-trip deal

£564 or less

Good one-way deal

£550 or less
Icelandair
  • Icelandair
  • 12/6-22/6
  • 2 total stops
  • 39h 40m total
  • London to Washington
Search Deals
WestJet
  • WestJet
  • 15/6
  • 1 total stop
  • 31h 55m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£50 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Washington.
Search Deals
Price to beat on a one-way flight from London Heathrow to Washington.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to 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, Cheapflights users made 858,174 searches. Data last updated 27 May 2026.
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

Cheapest return flight

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 12/10

09:55-16:39

1 stop14h 44m

Seattle/Tacoma Intl

Tue 1/12

16:48-10:30

Nonstop9h 42m

£555

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 25/6

21:25-11:45

1 stop22h 20m

Seattle/Tacoma Intl

Fri 10/7

23:25-11:55

1 stop28h 30m

£584

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 15/6

21:25-11:45

1 stop22h 20m

Seattle/Tacoma Intl

Sat 12/9

23:25-20:20

1 stop12h 55m

£619

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 20/6

08:40-16:24

1 stop15h 44m

Seattle/Tacoma Intl

Sun 5/7

18:20-12:10

Nonstop9h 50m

£627

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 25/6

11:40-14:00

Nonstop10h 20m

Seattle/Tacoma Intl

Thu 2/7

21:50-15:35

Nonstop9h 45m

£637

LondonBellingham

LHR - BLI

LHRBLI

London Heathrow

Wed 14/10

17:00-23:53

1 stop14h 53m

Bellingham

Sun 18/10

05:16-15:05

1 stop25h 49m

£644

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 12/9

15:35-13:45

2 stops30h 10m

Seattle/Tacoma Intl

Thu 24/9

10:35-16:00

2 stops21h 25m

£644

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 20/6

11:45-16:24

1 stop12h 39m

Seattle/Tacoma Intl

Sat 27/6

18:15-12:05

Nonstop9h 50m

£647

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 12/8

08:40-16:27

1 stop15h 47m

Seattle/Tacoma Intl

Tue 18/8

07:15-06:20

1 stop15h 05m

£660

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 1/7

17:45-20:03

Nonstop10h 18m

Seattle/Tacoma Intl

Wed 8/7

07:15-06:45

1 stop15h 30m

£671

Flights are sorted by cheapest return flights first.

Deals found on 22/5

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from Heathrow to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Heathrow with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Washington

What is the cheapest month to book a flight from London Heathrow Airport to State of Washington?

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £299). Flying from London Heathrow Airport to State of Washington in August is currently the most expensive (average of £649). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LHR to WA?

Find hourly flight availability from Heathrow to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 May 2026.

When flying from London Heathrow Airport to State of Washington, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from London Heathrow Airport to State of Washington

Explore weekly flight availability from Heathrow to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 27 May 2026.

The most flights from LHR to USWA are scheduled on a Monday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (13 on average).

How much does it cost for a return flight from London Heathrow Airport to State of Washington?

How far ahead should I book a flight from London Heathrow Airport to State of Washington?

The price you pay for your flight from London Heathrow Airport to State of Washington may vary depending on when you book. For the best chance of a lower fare, look to book 80 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated 27 May 2026.
Get a feel of what it's like to fly with KLM,Virgin Atlantic, andAir France from London Heathrow Airport to Washington by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,522 reviews
Check prices

Entertainment

7.2

Crew

8.4

Food

7.3

Comfort

7.7

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7.8
Good
1,522 reviews
KLM
7.8
Good
1,522 reviews
Check prices

Entertainment

7.2

Crew

8.4

Food

7.3

Comfort

7.7

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Virgin Atlantic
7.5
Good
689 reviews
KLM
7.8
Good
1,522 reviews
Check prices

Entertainment

7.2

Crew

8.4

Food

7.3

Comfort

7.7

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Air France
7.4
Good
1,591 reviews
KLM
7.8
Good
1,522 reviews
Check prices

Entertainment

7.2

Crew

8.4

Food

7.3

Comfort

7.7

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Icelandair
7.0
Good
660 reviews
KLM
7.8
Good
1,522 reviews
Check prices

Entertainment

7.2

Crew

8.4

Food

7.3

Comfort

7.7

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
British Airways
6.7
Okay
8,005 reviews
KLM
7.8
Good
1,522 reviews
Check prices

Entertainment

7.2

Crew

8.4

Food

7.3

Comfort

7.7

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London Heathrow Airport to State of Washington?

    KLM, Icelandair, and Alaska Airlines can get you from London Heathrow Airport to State of Washington in just under 14h 44m. Your travel time can differ by up to 7h 36m. The distance from London Heathrow Airport to State of Washington is about 4783 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from London Heathrow Airport to State of Washington one-way?

    One-way options have recently been found by users for as low as £352 on Icelandair. Other airlines that offer cheap prices include British Airways from £369 and KLM from £387 one-way.

  • What are the most popular routes from London Heathrow Airport to State of Washington?

    When deciding which route to take from London Heathrow Airport to State of Washington consider London Heathrow - Seattle/Tacoma Intl, London Heathrow - Portland or London Heathrow - Spokane as they are the most popular.

  • What are the most reliable airlines from London Heathrow Airport to State of Washington?

    The top 3 most reliable airlines when flying from London Heathrow Airport to State of Washington are Delta (90%), Virgin Atlantic (90%) and KLM (90%).

  • What are the cheapest flights from London Heathrow Airport to State of Washington?

    Looking for the cheapest flight from London Heathrow Airport to State of Washington? While on average our users pay £1,734, our data indicates the cheapest price to be £445. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £434.

  • Can I find deals for flights from Heathrow to Washington that include hotel bookings?

    Yes. In addition to deals on Heathrow to Washington flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Washington.

  • Can I find deals for business class flights from Heathrow to Washington?

    Yes. Cheapflights offers flight deals from Heathrow to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to State of Washington?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £299). Flying from London Heathrow Airport to State of Washington in August is currently the most expensive (average of £649). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Heathrow to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Heathrow to Washington

Discover the top 10 airlines that operate flights from Heathrow to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 27 May 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£333Average£545FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£340Average£469FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£416Average£694FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£426Average£640FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£440Average£710FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air FranceCheapest£449Average£639FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£455Average£631FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£461Average£612FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapest£462Average£496FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£465Average£629FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Heathrow to Washington?

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Why should you use Cheapflights to find cheap flight tickets from Heathrow to Washington?

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Washington for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Heathrow to Washington with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Heathrow to Washington flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Heathrow to Washington become cheaper?

Not ready to book yet? You can track prices for flights from Heathrow to Washington on Cheapflights with our Price Alert feature and get notified when better prices are available.

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