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Cheap flights from London Heathrow Airport to Washington from £311

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
2 Aug — 9 Aug1
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 3 July 2026.

Fri 9/1013:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Fri 16/1015:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 29/6£449
Tue 8/913:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Wed 30/915:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 29/6£450
Wed 26/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Wed 9/920:20
SEA
-
LHR
Nonstop9h 25m
British Airways
Deal found 30/6£452
Sun 4/1013:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Fri 9/1019:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 30/6£452
Fri 28/813:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Sat 5/923:25
SEA
-
LHR
1 stop12h 55m
Icelandair
Deal found 30/6£459
Fri 4/913:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Mon 7/919:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 29/6£460
Sat 11/721:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Sat 18/719:00
SEA
-
LHR
1 stop32h 55m
Icelandair
Deal found 1/7£461
Wed 9/921:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Wed 23/919:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 30/6£463
Thu 13/812:25
LHR
-
SEA
1 stop16h 25m
Delta
Sat 22/821:45
SEA
-
LHR
Nonstop9h 50m
Delta
Deal found 28/6£464
Wed 8/721:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Wed 15/723:25
SEA
-
LHR
1 stop12h 55m
Icelandair
Deal found 29/6£467
Tue 7/721:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Wed 29/719:00
SEA
-
LHR
1 stop32h 55m
Icelandair
Deal found 30/6£467
Fri 21/821:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Fri 11/915:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 30/6£468

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 3 July 2026.

Round-trip from

£449

One-way from

£311

Popular in

July

Cheapest in

February

Average price

£647

Good round-trip deal

£538 or less

Good one-way deal

£527 or less
Icelandair
  • Icelandair
  • 9/10-16/10
  • 2 total stops
  • 25h 05m total
  • London to Washington
Search Deals
9/9
  • 9/9
  • 3 total stops
  • 49h 00m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£47 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 July 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 3 July 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

Sun 27/9

21:25-17:55

1 stop28h 30m

Seattle/Tacoma Intl

Mon 5/10

15:40-20:20

1 stop20h 40m

£536

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 19/9

06:55-16:59

1 stop18h 04m

Seattle/Tacoma Intl

Sat 26/9

10:55-11:55

2 stops17h 00m

£544

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 29/8

13:10-20:52

1 stop15h 42m

Seattle/Tacoma Intl

Sun 6/9

13:30-06:45

Nonstop9h 15m

£556

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 24/9

13:05-17:55

1 stop12h 50m

Seattle/Tacoma Intl

Fri 2/10

15:40-11:55

1 stop12h 15m

£564

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 4/9

11:40-14:00

Nonstop10h 20m

Seattle/Tacoma Intl

Mon 7/9

18:20-12:10

Nonstop9h 50m

£568

LondonBellingham

LHR - BLI

LHRBLI

London Heathrow

Wed 7/10

17:00-13:29

1 stop28h 29m

Bellingham

Sun 11/10

14:09-15:05

1 stop16h 56m

£569

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 21/8

06:55-16:59

1 stop18h 04m

Seattle/Tacoma Intl

Mon 31/8

11:03-11:55

2 stops16h 52m

£570

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 25/9

11:25-23:26

2 stops20h 01m

Seattle/Tacoma Intl

Mon 28/9

15:55-12:25

1 stop12h 30m

£576

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 8/9

06:40-17:09

2 stops18h 29m

Spokane

Tue 6/10

13:00-17:40

2 stops20h 40m

£580

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 29/7

07:45-19:36

1 stop19h 51m

Seattle/Tacoma Intl

Wed 5/8

12:50-12:35

1 stop15h 45m

£599

Flights are sorted by cheapest return flights first.

Deals found on 2/7

Showing 1-10 of 58 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 £302). Flying from London Heathrow Airport to State of Washington in August is currently the most expensive (average of £617). 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 3 July 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 3 July 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 (17 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 3 July 2026.
Get a feel of what it's like to fly with Alaska Airlines,KLM, andVirgin Atlantic 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.
Alaska Airlines
7.9
Good
12,607 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Alaska Airlines
7.9
Good
12,607 reviews
Alaska Airlines
7.9
Good
12,607 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
KLM
7.8
Good
1,532 reviews
Alaska Airlines
7.9
Good
12,607 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Virgin Atlantic
7.5
Good
690 reviews
Alaska Airlines
7.9
Good
12,607 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Icelandair
7.0
Good
697 reviews
Alaska Airlines
7.9
Good
12,607 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
British Airways
6.7
Okay
8,091 reviews
Alaska Airlines
7.9
Good
12,607 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

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, United Airlines, and British Airways can get you from London Heathrow Airport to State of Washington in just under 15h 42m. Your travel time can differ by up to 12h 48m. 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 £355 on Icelandair. Other airlines that offer cheap prices include British Airways from £367 and KLM from £394 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 Scandinavian Airlines (88%), KLM (84%) and Air France (84%).

  • 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 £1,820, our data indicates the cheapest price to be £371. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £461.

  • 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 £302). Flying from London Heathrow Airport to State of Washington in August is currently the most expensive (average of £617). 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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Heathrow to Ontario flights
Luton to Miami flights
London City to Hobby flights
Luton to Los Angeles flights
Gatwick to Dallas/Fort Worth flights
Gatwick to San Francisco flights
Gatwick to Dulles Intl flights
Heathrow to Reagan-National flights
London City to San Francisco flights
London City to Boston flights
Heathrow to Denver flights
Stansted to San Francisco flights

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 3 July 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£337Average£531FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£343Average£488FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£394Average£621FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£431Average£758FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£440Average£621FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£444Average£632FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£453Average£647FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£462Average£642FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£470Average£592FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£477Average£679FlexibilityNo cancel feeOn-time76%
Search Finnair flights

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