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Cheap flights from London Heathrow Airport to Washington from £380

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 18/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
30 Mar — 6 Apr1
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 25 March 2025.

Round-trip from

£448

One-way from

£380

Popular in

August

Cheapest in

January

Average price

£525

Good round-trip deal

£560 or less

Good one-way deal

£613 or less
United Airlines
  • United Airlines
  • 2/6-17/6
  • 3 total stops
  • 48h 26m total
  • London to Washington
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18/4
  • 18/4
  • 3 total stops
  • 58h 39m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£85 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 March 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 25 March 2025.

Mon 2/616:15LHR - SEA
2 stops29h 46mUnited Airlines
Tue 17/607:20SEA - LHR
1 stop18h 40mUnited Airlines
Deal found 24/3£448
Thu 24/421:25LHR - SEA
1 stop28h 25mIcelandair
Thu 29/515:45SEA - LHR
1 stop12h 10mIcelandair
Deal found 24/3£449
Fri 25/406:30LHR - SEA
1 stop13h 55mMultiple Airlines
Fri 2/507:20SEA - LHR
1 stop15h 10mMultiple Airlines
Deal found 24/3£455
Wed 24/906:55LHR - SEA
1 stop18h 04mLufthansa
Mon 29/910:00SEA - LHR
2 stops16h 00mLufthansa
Deal found 24/3£465
Mon 21/406:20LHR - SEA
1 stop18h 39mBritish Airways
Mon 28/413:30SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 24/3£469
Sun 20/420:55LHR - SEA
1 stop22h 50mKLM
Tue 29/420:20SEA - LHR
Nonstop9h 55mKLM
Deal found 24/3£469
Mon 21/415:10LHR - SEA
1 stop17h 41mFinnair
Mon 5/517:40SEA - LHR
1 stop13h 30mFinnair
Deal found 24/3£474
Mon 21/419:45LHR - SEA
1 stop29h 55mVirgin Atlantic
Mon 5/517:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 24/3£479
Sat 6/914:05LHR - SEA
2 stops27h 16mAir Canada
Thu 18/913:45SEA - LHR
2 stops14h 05mAir Canada
Deal found 24/3£481
Mon 21/406:30LHR - SEA
1 stop13h 15mDelta
Mon 5/520:20SEA - LHR
Nonstop9h 55mDelta
Deal found 25/3£493
Mon 16/610:20LHR - SEA
1 stop13h 40mAmerican Airlines
Wed 30/717:40SEA - LHR
1 stop13h 30mAmerican Airlines
Deal found 24/3£502
Mon 2/606:40LHR - SEA
1 stop15h 10mScandinavian Airlines
Mon 16/616:00SEA - LHR
2 stops18h 50mScandinavian Airlines
Deal found 24/3£525

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 25 March 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

Mon 2/6

16:15-14:01

2 stops29h 46m

Seattle/Tacoma Intl

Tue 17/6

07:20-10:00

1 stop18h 40m

£448

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 24/4

21:25-17:50

1 stop28h 25m

Seattle/Tacoma Intl

Thu 29/5

15:45-11:55

1 stop12h 10m

£449

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 25/4

06:30-12:25

1 stop13h 55m

Seattle/Tacoma Intl

Fri 2/5

10:00-11:50

2 stops17h 50m

£455

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 8/5

08:40-18:33

2 stops17h 53m

Seattle/Tacoma Intl

Wed 14/5

10:00-10:00

2 stops16h 00m

£465

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

06:20-16:59

1 stop18h 39m

Seattle/Tacoma Intl

Mon 28/4

13:30-06:50

Nonstop9h 20m

£469

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 20/4

20:55-11:45

1 stop22h 50m

Seattle/Tacoma Intl

Tue 29/4

20:20-14:15

Nonstop9h 55m

£469

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

15:10-00:51

1 stop17h 41m

Seattle/Tacoma Intl

Mon 5/5

17:40-15:10

1 stop13h 30m

£474

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

19:45-17:40

1 stop29h 55m

Seattle/Tacoma Intl

Mon 5/5

17:35-11:20

Nonstop9h 45m

£479

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 18/4

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Tue 29/4

14:18-11:45

1 stop13h 27m

£486

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Mon 5/5

20:20-14:15

Nonstop9h 55m

£493

Flights are sorted by cheapest return flights first.

Deals found on 25/3

Showing 1-10 of 50 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 25 March 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 25 March 2025.

The most flights from LHR to USWA are scheduled on a Friday (21 on average). You will have fewer flight options on Monday, 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 25 March 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
7,890 reviews
Check prices

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,890 reviews
Delta
8.0
Very Good
7,890 reviews
Check prices

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,318 reviews
Delta
8.0
Very Good
7,890 reviews
Check prices

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,266 reviews
Delta
8.0
Very Good
7,890 reviews
Check prices

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,569 reviews
Delta
8.0
Very Good
7,890 reviews
Check prices

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,423 reviews
Delta
8.0
Very Good
7,890 reviews
Check prices

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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 £395 on WestJet. Other airlines that offer cheap prices include Aer Lingus from £411 and Icelandair from £425 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 Aeromexico (98%), Singapore Airlines (98%) and KLM (92%).

  • 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 £1,885, our data indicates the cheapest price to be £481. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £391.

  • 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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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 25 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£693FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£384Average£519FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£400Average£593FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£410Average£592FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£421Average£660FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£423Average£650FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£430Average£594FlexibilityNo cancel feeOn-time76%
Search Finnair flights
DeltaCheapest£446Average£859FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapest£450Average£1,053FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£470Average£822FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Heathrow to Washington flexibly with Cheapflights today.

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Not ready to book yet? You can track prices for flights from Heathrow to Washington on Cheapflights with our Price Alert feature and get notified when better prices are available.

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