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Cheap flights from London Heathrow Airport to Washington from £320

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
10 Apr — 17 Apr1
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 11 March 2026.

Mon 13/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Mon 27/419:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 10/3£416
Thu 16/406:40
LHR
-
SEA
2 stops22h 00m
Multiple Airlines
Mon 27/415:40
SEA
-
LHR
2 stops21h 40m
Multiple Airlines
Deal found 5/3£420
Mon 20/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Mon 4/515:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 6/3£424
Mon 20/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Sat 2/519:00
SEA
-
LHR
1 stop32h 55m
Icelandair
Deal found 8/3£428
Thu 23/407:00
LHR
-
SEA
2 stops42h 55m
Multiple Airlines
Thu 30/419:00
SEA
-
LHR
2 stops17h 10m
Multiple Airlines
Deal found 9/3£432
Wed 25/1114:55
LHR
-
SEA
Nonstop10h 00m
British Airways
Wed 2/1218:50
SEA
-
LHR
Nonstop9h 30m
British Airways
Deal found 8/3£436
Wed 18/312:15
LHR
-
SEA
1 stop12h 45m
Icelandair
Tue 31/319:00
SEA
-
LHR
1 stop32h 55m
Icelandair
Deal found 9/3£439
Tue 21/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Tue 28/419:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 6/3£443
Thu 16/413:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Wed 29/419:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 6/3£444
Mon 13/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Tue 28/415:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 9/3£445
Wed 15/410:15
LHR
-
PDX
2 stops54h 55m
Air Canada
Sat 18/407:15
PDX
-
LHR
2 stops46h 05m
Air Canada
Deal found 6/3£469
Fri 17/407:05
LHR
-
PDX
2 stops18h 55m
Multiple Airlines
Sat 25/415:30
PDX
-
LHR
2 stops16h 55m
Multiple Airlines
Deal found 5/3£481

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 11 March 2026.

Round-trip from

£416

One-way from

£320

Popular in

July

Cheapest in

February

Average price

£536

Good round-trip deal

£607 or less

Good one-way deal

£499 or less
Icelandair
  • Icelandair
  • 13/4-27/4
  • 2 total stops
  • 48h 35m total
  • London to Washington
Search Deals
12/5
  • 12/5
  • 3 total stops
  • 42h 19m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£56 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 11 March 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

Wed 22/4

21:25-17:55

1 stop28h 30m

Seattle/Tacoma Intl

Sun 26/4

19:00-20:20

1 stop17h 20m

£476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 25/4

21:25-20:40

1 stop31h 15m

Seattle/Tacoma Intl

Sat 2/5

19:00-20:20

1 stop17h 20m

£484

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 7/5

13:05-17:55

1 stop12h 50m

Seattle/Tacoma Intl

Sun 10/5

19:00-20:20

1 stop17h 20m

£487

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 7/5

13:05-17:55

1 stop12h 50m

Seattle/Tacoma Intl

Wed 13/5

19:00-20:20

1 stop17h 20m

£487

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 27/4

06:00-22:42

2 stops24h 42m

Seattle/Tacoma Intl

Mon 4/5

07:00-07:55

2 stops16h 55m

£565

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 4/5

08:40-21:40

2 stops21h 00m

Spokane

Sun 10/5

05:00-07:40

2 stops42h 40m

£601
Fastest return journey

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 3/9

17:00-18:55

Nonstop9h 55m

Seattle/Tacoma Intl

Thu 17/9

21:45-15:05

Nonstop9h 20m

£604

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 29/4

07:25-18:51

2 stops19h 26m

Spokane

Sun 3/5

16:10-09:40

1 stop33h 30m

£605

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 22/4

09:50-11:35

Nonstop9h 45m

Seattle/Tacoma Intl

Sun 26/4

12:34-07:50

1 stop35h 16m

£609

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 21/8

19:50-13:45

2 stops25h 55m

Seattle/Tacoma Intl

Fri 11/9

15:55-16:00

1 stop16h 05m

£622

Flights are sorted by cheapest return flights first.

Deals found on 10/3

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
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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 £368). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £511). 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 11 March 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 11 March 2026.

The most flights from LHR to USWA are scheduled on a Tuesday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 on average).

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

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 11 March 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
1,469 reviews
Check prices

Overall

7.8

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.8
Good
1,469 reviews
KLM
7.8
Good
1,469 reviews
Check prices

Overall

7.8

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Virgin Atlantic
7.5
Good
680 reviews
KLM
7.8
Good
1,469 reviews
Check prices

Overall

7.8

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Air France
7.4
Good
1,543 reviews
KLM
7.8
Good
1,469 reviews
Check prices

Overall

7.8

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Icelandair
7.1
Good
619 reviews
KLM
7.8
Good
1,469 reviews
Check prices

Overall

7.8

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
British Airways
6.7
Okay
7,781 reviews
KLM
7.8
Good
1,469 reviews
Check prices

Overall

7.8

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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?

    Icelandair, SWISS, and United Airlines can get you from London Heathrow Airport to State of Washington in just under 21h. Your travel time can differ by up to 7h 30m. The distance from London Heathrow Airport to State of Washington is about 4643 mi. This flight may include one or multiple stops.

  • 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 KLM (93%), Air France (93%) and Delta (93%).

  • 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 £1,756, our data indicates the cheapest price to be £423. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £432.

  • 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 £368). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £511). 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 11 March 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£335Average£538FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£340Average£457FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£405Average£624FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£417Average£675FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£422Average£606FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£427Average£612FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£441Average£620FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£448Average£620FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air FranceCheapest£449Average£637FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£460Average£633FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

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

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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.

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