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Cheap flights from London Heathrow Airport to Washington from £306

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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
23 Aug — 30 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 24 July 2026.

Mon 31/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Wed 16/913:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 21/7£450
Tue 20/1013:05
LHR
-
SEA
1 stop15h 35m
Multiple Airlines
Tue 10/1108:18
SEA
-
LHR
2 stops15h 47m
Multiple Airlines
Deal found 19/7£451
Mon 24/821:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Mon 7/915:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 23/7£453
Mon 21/910:35
LHR
-
SEA
1 stop18h 08m
United Airlines
Mon 21/922:58
SEA
-
LHR
1 stop22h 57m
United Airlines
Deal found 23/7£455
Wed 11/1112:15
LHR
-
SEA
1 stop12h 45m
Multiple Airlines
Wed 25/1108:31
SEA
-
LHR
2 stops15h 34m
Multiple Airlines
Deal found 23/7£456
Tue 20/1013:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Tue 10/1114:35
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 19/7£457
Tue 1/909:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Sat 12/913:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 21/7£458
Sat 29/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Thu 17/920:20
SEA
-
LHR
Nonstop9h 25m
British Airways
Deal found 21/7£459
Wed 7/1013:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Wed 14/1015:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 24/7£460
Tue 25/821:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Mon 7/915:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 24/7£461
Wed 9/913:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Wed 30/915:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 24/7£464
Thu 1/1017:00
LHR
-
BLI
1 stop14h 44m
Alaska Airlines
Sun 4/1019:18
BLI
-
LHR
1 stop11h 47m
Alaska Airlines
Deal found 20/7£548

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 24 July 2026.

Round-trip from

£450

One-way from

£306

Popular in

December

Cheapest in

February

Average price

£632

Good round-trip deal

£512 or less

Good one-way deal

£414 or less
British Airways
  • British Airways
  • 31/8-16/9
  • Nonstop
  • 19h 00m total
  • London to Washington
Search Deals
Icelandair
  • Icelandair
  • 11/11
  • 1 total stop
  • 12h 45m total
  • London to Washington
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 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 24 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

Fri 11/9

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Fri 11/12

15:15-11:50

1 stop12h 35m

£532

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 10/9

10:50-16:59

1 stop14h 09m

Seattle/Tacoma Intl

Wed 23/9

08:10-06:55

1 stop14h 45m

£533

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 18/9

07:25-16:59

1 stop17h 34m

Seattle/Tacoma Intl

Sat 26/9

08:30-10:25

2 stops17h 55m

£533

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 4/9

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Fri 11/9

08:40-09:40

1 stop17h 00m

£533

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 13/9

07:30-19:14

2 stops19h 44m

Seattle/Tacoma Intl

Sat 19/9

09:00-14:10

1 stop21h 10m

£538

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 29/8

08:00-20:43

2 stops20h 43m

Seattle/Tacoma Intl

Sat 29/8

23:04-06:55

1 stop23h 51m

£539

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 19/9

08:00-20:43

2 stops20h 43m

Seattle/Tacoma Intl

Sat 19/9

22:58-21:20

1 stop14h 22m

£539

LondonBellingham

LHR - BLI

LHRBLI

London Heathrow

Thu 1/10

17:00-23:44

1 stop14h 44m

Bellingham

Sun 4/10

19:18-15:05

1 stop11h 47m

£548

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 17/12

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Sat 26/12

14:35-10:50

1 stop12h 15m

£557

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/9

10:50-16:59

1 stop14h 09m

Seattle/Tacoma Intl

Wed 16/12

07:45-06:30

1 stop14h 45m

£569

Flights are sorted by cheapest return flights first.

Deals found on 24/7

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, January is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £513). Flying from London Heathrow Airport to State of Washington in December is currently the most expensive (average of £694). 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 24 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 24 July 2026.

The most flights from LHR to USWA are scheduled on a Tuesday (24 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?

Airfare is below average for this route at the moment.
London Heathrow Airport to State of Washington flights typically cost between £561 and £723 in August.
The cheapest return price found within the last 5 days was £450 on British Airways (31 Aug–16 Sept).

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 56 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 24 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
12,705 reviews
Check prices

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

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
12,705 reviews
Alaska Airlines
7.9
Good
12,705 reviews
Check prices

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

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
1,544 reviews
Alaska Airlines
7.9
Good
12,705 reviews
Check prices

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

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
694 reviews
Alaska Airlines
7.9
Good
12,705 reviews
Check prices

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

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
717 reviews
Alaska Airlines
7.9
Good
12,705 reviews
Check prices

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

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
8,130 reviews
Alaska Airlines
7.9
Good
12,705 reviews
Check prices

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

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?

    United Airlines, Alaska Airlines, and Scandinavian 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 10h 35m. The distance from London Heathrow Airport to State of Washington is about 4712 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 Scandinavian Airlines (88%), KLM (79%) and Air France (79%).

  • 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 £1,557, our data indicates the cheapest price to be £336. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £397.

  • 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £513). Flying from London Heathrow Airport to State of Washington in December is currently the most expensive (average of £694). 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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London City to Miami flights
London City to Dulles Intl flights
Stansted to Miami flights
Stansted to Dulles Intl flights
London City to Boston flights
Heathrow to Ontario flights
Gatwick to San Francisco flights
Luton to Dulles Intl flights
Luton to Los Angeles flights
Heathrow to Denver flights
Gatwick to Dallas/Fort Worth flights
London City to San Francisco flights
Heathrow to Nashville 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 24 July 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£336Average£530FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£343Average£491FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£393Average£622FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£426Average£756FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£433Average£644FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£439Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£443Average£648FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£453Average£641FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£459Average£642FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£473Average£569FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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