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Cheap flights from London Heathrow Airport to Washington from £324

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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
3 Sep — 10 Sep1
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 4 August 2026.

Mon 31/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Fri 18/913:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 3/8£450
Mon 12/1021:25
LHR
-
SEA
1 stop28h 30m
Icelandair
Mon 19/1019:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 30/7£452
Sun 25/1013:35
LHR
-
SEA
1 stop29h 44m
Lufthansa
Tue 27/1010:40
SEA
-
LHR
1 stop13h 45m
Lufthansa
Deal found 1/8£453
Wed 26/813:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Fri 18/915:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 3/8£454
Tue 6/1021:25
LHR
-
SEA
1 stop28h 30m
Icelandair
Mon 12/1015:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 30/7£457
Tue 6/1013:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Mon 19/1015:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 31/7£459
Sun 1/1120:35
LHR
-
SEA
1 stop28h 25m
Multiple Airlines
Tue 10/1108:18
SEA
-
LHR
2 stops15h 47m
Multiple Airlines
Deal found 3/8£461
Tue 25/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Wed 16/913:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 3/8£462
Sat 10/1021:25
LHR
-
SEA
1 stop28h 30m
Multiple Airlines
Tue 10/1108:18
SEA
-
LHR
2 stops15h 47m
Multiple Airlines
Deal found 30/7£462
Wed 26/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Sat 19/920:20
SEA
-
LHR
Nonstop9h 25m
British Airways
Deal found 3/8£463
Fri 2/1013:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Mon 5/1015:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 1/8£467
Tue 25/811:05
LHR
-
SEA
1 stop16h 02m
United Airlines
Sat 19/915:54
SEA
-
LHR
1 stop12h 31m
United Airlines
Deal found 3/8£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 4 August 2026.

Round-trip from

£450

One-way from

£324

Popular in

December

Cheapest in

February

Average price

£594

Good round-trip deal

£565 or less

Good one-way deal

£564 or less
British Airways
  • British Airways
  • 31/8-18/9
  • Nonstop
  • 19h 00m total
  • London to Washington
Search Deals
4/9
  • 4/9
  • 3 total stops
  • 49h 50m 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 August 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 4 August 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 16/9

10:50-16:59

1 stop14h 09m

Seattle/Tacoma Intl

Fri 25/9

09:05-09:40

2 stops16h 35m

£525

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 1/9

07:25-19:07

2 stops19h 42m

Seattle/Tacoma Intl

Tue 8/9

15:30-14:10

1 stop14h 40m

£534

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 17/9

07:25-19:14

2 stops19h 49m

Seattle/Tacoma Intl

Thu 24/9

08:30-10:25

2 stops17h 55m

£535
Fastest return journey

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 28/8

11:40-14:00

Nonstop10h 20m

Seattle/Tacoma Intl

Sat 12/9

21:50-15:35

Nonstop9h 45m

£563

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 1/9

11:40-14:00

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 8/9

17:30-11:20

Nonstop9h 50m

£569

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 4/9

17:45-20:10

Nonstop10h 25m

Seattle/Tacoma Intl

Sat 19/9

21:50-15:35

Nonstop9h 45m

£571

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 11/9

14:25-21:36

1 stop15h 11m

Seattle/Tacoma Intl

Tue 22/9

14:12-12:50

1 stop14h 38m

£574

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 13/9

18:30-20:53

Nonstop10h 23m

Seattle/Tacoma Intl

Sat 19/9

22:40-20:10

1 stop13h 30m

£584

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Sat 12/9

06:40-17:09

2 stops18h 29m

Spokane

Sat 19/9

13:00-16:25

3 stops19h 25m

£586

LondonBellingham

LHR - BLI

LHRBLI

London Heathrow

Wed 14/10

17:00-23:53

1 stop14h 53m

Bellingham

Sat 17/10

19:18-15:05

1 stop11h 47m

£591

Flights are sorted by cheapest return flights first.

Deals found on 4/8

Showing 1-10 of 60 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £509). Flying from London Heathrow Airport to State of Washington in December is currently the most expensive (average of £687). 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 4 August 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 4 August 2026.

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

Airfare is below average for this route at the moment.
London Heathrow Airport to State of Washington flights typically cost between £528 and £694 in August.
The cheapest return price found within the last 5 days was £450 on British Airways (31 Aug–18 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 4 August 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
12,762 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Food

7.0

Comfort

7.8

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
12,762 reviews
Alaska Airlines
7.9
Good
12,762 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Food

7.0

Comfort

7.8

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
1,553 reviews
Alaska Airlines
7.9
Good
12,762 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Food

7.0

Comfort

7.8

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
12,762 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Food

7.0

Comfort

7.8

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
721 reviews
Alaska Airlines
7.9
Good
12,762 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Food

7.0

Comfort

7.8

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
8,147 reviews
Alaska Airlines
7.9
Good
12,762 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Food

7.0

Comfort

7.8

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?

    Lufthansa, United Airlines, and Delta can get you from London Heathrow Airport to State of Washington in just under 13h 07m. Your travel time can differ by up to 5h 40m. 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 £363 and Virgin Atlantic from £366 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 (85%), KLM (77%) and Air France (77%).

  • 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 £1,819, our data indicates the cheapest price to be £379. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £412.

  • 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 £509). Flying from London Heathrow Airport to State of Washington in December is currently the most expensive (average of £687). 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
Heathrow to Hobby flights
Stansted to Los Angeles flights
London City to Orlando flights
Heathrow to Baltimore flights
Luton to Los Angeles flights
Heathrow to Ontario flights
Heathrow to George Bush Intcntl flights
Gatwick to Boston flights
Gatwick to San Francisco flights
Heathrow to Tampa flights
Luton to Miami flights
Heathrow to Denver flights
Gatwick to Dallas/Fort Worth flights
London City to San Francisco flights
Gatwick to O'Hare Intl flights
Stansted to San Francisco flights
London City to O'Hare Intl flights
Stansted to O'Hare Intl flights
Heathrow to Love Field flights
Stansted to Dallas/Fort Worth 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 4 August 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£334Average£513FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£340Average£487FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£390Average£619FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£423Average£756FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£429Average£639FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£433Average£610FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£440Average£636FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£449Average£634FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£460Average£669FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£461Average£642FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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