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Cheap flights from London Heathrow Airport to Washington from £343

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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
11 Dec — 18 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 November 2025.

Wed 26/1112:15LHR - SEA
1 stop12h 45mIcelandair
Mon 1/1214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 8/11£467
Tue 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
Fri 9/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 8/11£470
Tue 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
Sun 11/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 7/11£475
Thu 4/1212:15LHR - SEA
1 stop12h 45mIcelandair
Thu 8/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 8/11£477
Wed 3/1212:15LHR - SEA
1 stop12h 45mIcelandair
Mon 12/114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 8/11£479
Tue 2/1220:35LHR - SEA
1 stop28h 25mIcelandair
Tue 6/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 8/11£480
Tue 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
Wed 14/114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 10/11£481
Mon 8/1206:30LHR - SEA
1 stop13h 20mKLM
Thu 15/116:45SEA - LHR
Nonstop9h 45mKLM
Deal found 8/11£482
Tue 2/1220:35LHR - SEA
1 stop28h 25mIcelandair
Sat 6/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 10/11£482
Thu 4/1212:15LHR - SEA
1 stop12h 45mIcelandair
Wed 10/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 10/11£483
Thu 4/1212:15LHR - SEA
1 stop12h 45mIcelandair
Wed 7/114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 8/11£484
Tue 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
Mon 5/114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 10/11£485

Cheap 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 November 2025.

Round-trip from

£467

One-way from

£343

Popular in

July

Cheapest in

January

Average price

£544

Good round-trip deal

£559 or less

Good one-way deal

£488 or less
Icelandair
  • Icelandair
  • 26/11-1/12
  • 2 total stops
  • 25h 00m total
  • London to Washington
Search Deals
10/1
  • 10/1
  • 2 total stops
  • 25h 40m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£57 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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 November 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Washington that are best for you.

Fly from

Heathrow

Fly to

Washington

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 16/12

20:35-17:00

1 stop28h 25m

Seattle/Tacoma Intl

Wed 14/1

14:35-10:50

1 stop12h 15m

£481

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 13/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Thu 19/2

18:50-12:20

Nonstop9h 30m

£501

LondonPortland

LHR - PDX

LHRPDX

London Heathrow

Sat 7/3

20:35-17:00

1 stop28h 25m

Portland

Sat 14/3

15:45-19:30

1 stop20h 45m

£526

LondonPortland

LHR - PDX

LHRPDX

London Heathrow

Thu 5/3

20:35-17:00

1 stop28h 25m

Portland

Tue 10/3

15:45-10:50

1 stop12h 05m

£526

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 25/12

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Thu 8/1

19:20-12:50

Nonstop9h 30m

£545

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 2/12

11:10-13:20

1 stop34h 10m

Seattle/Tacoma Intl

Thu 11/12

07:00-06:40

2 stops15h 40m

£545

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 25/12

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Tue 13/1

16:45-10:30

Nonstop9h 45m

£548

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 16/12

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Thu 15/1

16:45-10:30

Nonstop9h 45m

£548

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 24/12

06:20-13:25

1 stop15h 05m

Seattle/Tacoma Intl

Mon 12/1

19:20-12:50

Nonstop9h 30m

£551

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 7/12

06:30-21:00

3 stops22h 30m

Seattle/Tacoma Intl

Thu 25/12

05:50-11:50

1 stop22h 00m

£552

Flights are sorted by cheapest return flights first.

Deals found on 10/11

Showing 1-10 of 52 results
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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 £384). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £519). 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 November 2025.

It’s typically best to fly out from London Heathrow Airport to State of Washington in the evening. Doing so could potentially save you 23% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from London Heathrow Airport to State of Washington?

Use this chart to determine the cheapest time to fly return from Heathrow to Washington. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to State of Washington flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 November 2025.

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).

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 November 2025.
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
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,410 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
673 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Air France
7.4
Good
1,486 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Icelandair
7.1
Good
578 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,510 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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, Finnair, and United Airlines can get you from London Heathrow Airport to State of Washington in just under 10h. Your travel time can differ by up to 24h 10m. 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 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 (97%), Air France (89%) and KLM (88%).

  • 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 £1,555, our data indicates the cheapest price to be £421. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £373.

  • 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 £384). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £519). 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 Las Vegas flights
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Stansted to Los Angeles 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 11 November 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£363Average£485FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£393Average£611FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£406Average£576FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£407Average£571FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£411Average£614FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£413Average£628FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£449Average£614FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£451Average£674FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£453Average£607FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Aer LingusCheapest£465Average£677FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

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