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Cheap flights from London Heathrow Airport to Washington from £406

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 25/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
5 May — 12 May1
1 adult

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 30 April 2025.

Round-trip from

£459

One-way from

£408

Popular in

August

Cheapest in

January

Average price

£529

Good round-trip deal

£545 or less

Good one-way deal

£627 or less
Finnair
  • Finnair
  • 13/5-18/5
  • 2 total stops
  • 32h 01m total
  • London to Washington
Search Deals
18/6
  • 18/6
  • 2 total stops
  • 22h 13m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£81 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2025
Search Deals
Price to beat on a round-trip flight from London Heathrow to Washington.
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Price to beat on a one-way flight from London Heathrow to Washington.
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Find flight deals from Heathrow to Washington

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 30 April 2025.

Thu 28/813:05LHR - SEA
1 stop15h 35mIcelandair
Tue 9/915:45SEA - LHR
1 stop20h 35mIcelandair
Deal found 28/4£456
Tue 16/906:00LHR - SEA
2 stops20h 36mSWISS
Tue 23/910:55SEA - LHR
2 stops24h 25mSWISS
Deal found 28/4£460
Wed 14/509:00LHR - SEA
1 stop15h 59mLufthansa
Wed 21/510:00SEA - LHR
2 stops17h 50mLufthansa
Deal found 28/4£461
Tue 13/506:30LHR - SEA
1 stop13h 55mUnited Airlines
Tue 20/512:45SEA - LHR
1 stop13h 40mUnited Airlines
Deal found 28/4£462
Fri 19/906:15LHR - SEA
1 stop13h 00mVirgin Atlantic
Mon 29/920:25SEA - LHR
Nonstop9h 50mVirgin Atlantic
Deal found 28/4£464
Mon 5/509:30LHR - SEA
1 stop18h 07mAir Canada
Mon 19/511:30SEA - LHR
1 stop13h 05mAir Canada
Deal found 28/4£465
Mon 26/506:40LHR - SEA
1 stop15h 10mScandinavian Airlines
Mon 2/616:00SEA - LHR
1 stop16h 00mScandinavian Airlines
Deal found 28/4£474
Mon 1/909:50LHR - SEA
1 stop16h 00mBritish Airways
Wed 1/1020:20SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 28/4£480
Mon 8/917:15LHR - SEA
2 stops27h 18mFinnair
Fri 26/912:09SEA - LHR
1 stop14h 11mFinnair
Deal found 28/4£483
Mon 5/506:30LHR - SEA
1 stop13h 10mDelta
Tue 13/517:35SEA - LHR
Nonstop9h 45mDelta
Deal found 28/4£485
Mon 12/509:55LHR - SEA
1 stop14h 02mKLM
Fri 23/517:35SEA - LHR
Nonstop9h 45mKLM
Deal found 28/4£495
Wed 18/610:20LHR - SEA
1 stop13h 40mAmerican Airlines
Wed 25/617:40SEA - LHR
1 stop13h 30mAmerican Airlines
Deal found 28/4£502

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 30 April 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

Thu 28/8

13:05-20:40

1 stop15h 35m

Seattle/Tacoma Intl

Tue 9/9

15:45-20:20

1 stop20h 35m

£456

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 13/5

09:25-11:10

Nonstop9h 45m

Seattle/Tacoma Intl

Sun 18/5

23:59-06:15

2 stops22h 16m

£459

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 16/9

06:00-18:36

2 stops20h 36m

Seattle/Tacoma Intl

Tue 23/9

10:55-19:20

2 stops24h 25m

£460

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 14/5

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Wed 21/5

10:00-11:50

2 stops17h 50m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 13/5

06:30-12:25

1 stop13h 55m

Seattle/Tacoma Intl

Tue 20/5

12:45-10:25

1 stop13h 40m

£462

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 19/9

06:15-11:15

1 stop13h 00m

Seattle/Tacoma Intl

Mon 29/9

20:25-14:15

Nonstop9h 50m

£464

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 17/9

17:25-19:50

Nonstop10h 25m

Seattle/Tacoma Intl

Tue 23/9

17:35-11:20

Nonstop9h 45m

£469

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 13/5

17:25-19:40

Nonstop10h 15m

Seattle/Tacoma Intl

Thu 22/5

20:20-14:15

Nonstop9h 55m

£473

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 7/9

08:30-19:31

2 stops19h 01m

Seattle/Tacoma Intl

Fri 19/9

07:20-08:35

2 stops17h 15m

£474

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 26/5

06:40-13:50

1 stop15h 10m

Seattle/Tacoma Intl

Mon 2/6

16:00-16:00

1 stop16h 00m

£474

Flights are sorted by cheapest return flights first.

Deals found on 28/4

Showing 1-10 of 58 results
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2
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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 £622). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £946). 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 30 April 2025.

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 30 April 2025.

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 (11 on average).

Rainfall in Washington by month

Plan your trip to Washington by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in State of Washington ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit State of Washington when rainfall is around 18.0 mm.

Temperature in Washington by month

Plan your trip to Washington by taking into account the average temperature totals by month.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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 30 April 2025.
See what other customers who have flown with Delta, KLM and Finnair from London to Washington have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,934 reviews
Check prices

Comfort

7.9

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very Good
7,934 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Comfort

7.9

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,334 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Comfort

7.9

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,275 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Comfort

7.9

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,588 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Comfort

7.9

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Comfort

7.9

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • 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 £409 on Aer Lingus. Other airlines that offer cheap prices include WestJet from £415 and Icelandair from £447 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 Singapore Airlines (94%), Aeromexico (92%) and KLM (91%).

  • 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 £1,371, our data indicates the cheapest price to be £473. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £438.

  • 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 £622). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £946). 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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Stansted to Newark flights
London City to LaGuardia flights
Heathrow to Midway flights
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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 30 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£672FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£367Average£489FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£386Average£574FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£396Average£572FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£399Average£609FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£407Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£415Average£568FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£433Average£1,015FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£445Average£828FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£450Average£781FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

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