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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 23/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
20 Nov — 27 Nov1
1 adult
1 adult, Economy

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 21 October 2025.

Mon 17/1120:35LHR - SEA
1 stop28h 25mIcelandair
Mon 1/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 20/10£445
Wed 26/1112:15LHR - SEA
1 stop12h 45mIcelandair
Wed 3/1214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 19/10£447
Wed 12/1112:15LHR - SEA
1 stop12h 45mIcelandair
Thu 4/1214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 20/10£451
Tue 25/1120:35LHR - SEA
1 stop28h 25mIcelandair
Wed 10/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 20/10£453
Tue 2/1212:15LHR - SEA
1 stop12h 45mIcelandair
Tue 9/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 20/10£456
Wed 26/1112:15LHR - SEA
1 stop12h 45mIcelandair
Mon 1/1214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 20/10£460
Tue 25/1112:15LHR - SEA
1 stop12h 45mIcelandair
Tue 2/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 20/10£462
Tue 4/1112:15LHR - SEA
1 stop12h 45mIcelandair
Tue 11/1114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 20/10£463
Tue 9/1207:40LHR - PDX
2 stops18h 50mLufthansa
Sun 14/1215:55PDX - LHR
1 stop31h 30mLufthansa
Deal found 20/10£526
Tue 2/1212:05LHR - PSC
2 stops40h 42mUnited Airlines
Tue 9/1205:04PSC - LHR
2 stops19h 21mUnited Airlines
Deal found 18/10£531
Mon 17/1112:15LHR - PDX
1 stop12h 45mIcelandair
Mon 1/1214:45PDX - LHR
1 stop20h 45mIcelandair
Deal found 20/10£534
Mon 17/1113:25LHR - PDX
2 stops27h 50mAir Canada
Mon 1/1209:50PDX - LHR
1 stop18h 00mAir Canada
Deal found 19/10£534

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 21 October 2025.

Round-trip from

£445

One-way from

£343

Popular in

July

Cheapest in

January

Average price

£541

Good round-trip deal

£524 or less

Good one-way deal

£514 or less
Icelandair
  • Icelandair
  • 17/11-1/12
  • 2 total stops
  • 49h 20m total
  • London to Washington
Search Deals
23/1
  • 23/1
  • 3 total stops
  • 38h 16m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£58 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 October 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 21 October 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 23/12

08:40-11:50

1 stop35h 10m

Seattle/Tacoma Intl

Tue 30/12

00:55-07:05

1 stop22h 10m

£482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 16/3

06:30-12:35

1 stop13h 05m

Seattle/Tacoma Intl

Mon 23/3

17:40-10:30

Nonstop9h 50m

£488

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/3

06:30-12:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 17/3

17:40-10:30

Nonstop9h 50m

£489

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/3

06:30-12:35

1 stop13h 05m

Seattle/Tacoma Intl

Wed 25/3

17:40-10:30

Nonstop9h 50m

£489

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/3

06:30-12:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 24/3

17:40-10:30

Nonstop9h 50m

£489

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 8/3

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 24/3

17:40-10:30

Nonstop9h 50m

£489

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 17/11

06:30-12:10

1 stop13h 40m

Seattle/Tacoma Intl

Mon 1/12

05:45-11:50

1 stop22h 05m

£496

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 26/11

06:35-13:20

1 stop14h 45m

Seattle/Tacoma Intl

Thu 4/12

13:40-11:15

1 stop13h 35m

£498

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/11

06:30-12:10

1 stop13h 40m

Seattle/Tacoma Intl

Tue 2/12

10:05-11:50

1 stop17h 45m

£499

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/11

06:30-12:10

1 stop13h 40m

Seattle/Tacoma Intl

Thu 4/12

13:40-11:15

1 stop13h 35m

£499

Flights are sorted by cheapest return flights first.

Deals found on 18/10

Showing 1-10 of 57 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 £353). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £501). 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 21 October 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 afternoons 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 21 October 2025.

The most flights from LHR to USWA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 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 21 October 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
1,404 reviews
Check prices

Comfort

7.6

Food

7.3

Crew

8.4

Overall

7.7

Boarding

7.8

Entertainment

7.1

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
1,404 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Comfort

7.6

Food

7.3

Crew

8.4

Overall

7.7

Boarding

7.8

Entertainment

7.1

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
670 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Comfort

7.6

Food

7.3

Crew

8.4

Overall

7.7

Boarding

7.8

Entertainment

7.1

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
1,475 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Comfort

7.6

Food

7.3

Crew

8.4

Overall

7.7

Boarding

7.8

Entertainment

7.1

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
7.0
Good
561 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Comfort

7.6

Food

7.3

Crew

8.4

Overall

7.7

Boarding

7.8

Entertainment

7.1

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
7,461 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Comfort

7.6

Food

7.3

Crew

8.4

Overall

7.7

Boarding

7.8

Entertainment

7.1

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?

    Delta, United Airlines, and Icelandair can get you from London Heathrow Airport to State of Washington in just under 12h 45m. Your travel time can differ by up to 22h 25m. The distance from London Heathrow Airport to State of Washington is about 4896 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 £399 on Lufthansa. Other airlines that offer cheap prices include United Airlines from £401 and Aer Lingus from £404 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 (95%), KLM (87%) and Air France (87%).

  • 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 £1,640, our data indicates the cheapest price to be £372. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £422.

  • 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 £353). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £501). 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 21 October 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£356Average£470FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£386Average£589FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£398Average£566FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£399Average£561FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£405Average£602FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£406Average£616FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£441Average£602FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£442Average£666FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£445Average£623FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Aer LingusCheapest£457Average£661FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

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

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