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Cheap flights from London Heathrow Airport to Washington from £377

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 20/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
13 Jul — 20 Jul1
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 8 July 2025.

Round-trip from

£473

One-way from

£377

Popular in

August

Cheapest in

January

Average price

£721

Good round-trip deal

£528 or less

Good one-way deal

£709 or less
Air Canada
  • Air Canada
  • 10/9-15/9
  • 4 total stops
  • 36h 41m total
  • London to Washington
20/8
  • 20/8
  • 3 total stops
  • 48h 05m total
  • London to Washington
Highest demand for flights based on searches. 15% potential increase in price (£73 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from London Heathrow to Washington.
Price to beat on a one-way flight from London Heathrow to Washington.

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 8 July 2025.

Wed 10/908:40LHR - SEA
2 stops18h 51mMultiple Airlines
Mon 15/910:00SEA - LHR
2 stops17h 50mMultiple Airlines
Deal found 7/7£473
Wed 3/908:40LHR - SEA
2 stops20h 14mSWISS
Thu 11/915:19SEA - LHR
2 stops22h 26mSWISS
Deal found 6/7£474
Sun 24/821:25LHR - SEA
1 stop22h 00mIcelandair
Tue 2/923:30SEA - LHR
1 stop12h 50mIcelandair
Deal found 7/7£474
Tue 9/919:15LHR - SEA
1 stop28h 50mVirgin Atlantic
Tue 23/920:25SEA - LHR
Nonstop9h 50mVirgin Atlantic
Deal found 5/7£478
Thu 4/921:05LHR - SEA
2 stops24h 45mScandinavian Airlines
Mon 8/916:00SEA - LHR
1 stop18h 30mScandinavian Airlines
Deal found 6/7£480
Tue 9/906:30LHR - SEA
2 stops20h 06mLufthansa
Thu 2/1010:00SEA - LHR
2 stops17h 50mLufthansa
Deal found 6/7£482
Mon 11/809:30LHR - SEA
1 stop14h 30mAmerican Airlines
Thu 21/817:40SEA - LHR
1 stop13h 30mAmerican Airlines
Deal found 5/7£485
Wed 24/906:30LHR - SEA
2 stops15h 46mUnited Airlines
Sat 1/1120:00SEA - LHR
1 stop32h 50mUnited Airlines
Deal found 7/7£486
Wed 27/808:15LHR - SEA
1 stop19h 43mJetBlue
Mon 15/923:40SEA - LHR
1 stop13h 05mJetBlue
Deal found 4/7£488
Tue 26/809:30LHR - SEA
1 stop19h 11mAir Canada
Tue 9/907:15SEA - LHR
1 stop15h 15mAir Canada
Deal found 4/7£495
Mon 25/809:55LHR - SEA
1 stop14h 00mDelta
Tue 9/920:25SEA - LHR
Nonstop9h 50mDelta
Deal found 7/7£498
Wed 24/912:15LHR - SEA
1 stop16h 27mAustrian Airlines
Wed 8/1008:00SEA - LHR
1 stop14h 55mAustrian Airlines
Deal found 7/7£499

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 8 July 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

Wed 10/9

08:40-19:31

2 stops18h 51m

Seattle/Tacoma Intl

Mon 15/9

10:00-11:50

2 stops17h 50m

£473

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 3/9

08:40-20:54

2 stops20h 14m

Seattle/Tacoma Intl

Thu 11/9

15:19-21:45

2 stops22h 26m

£474

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 24/8

21:25-11:25

1 stop22h 00m

Seattle/Tacoma Intl

Tue 2/9

23:30-20:20

1 stop12h 50m

£474

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 9/9

19:15-16:05

1 stop28h 50m

Seattle/Tacoma Intl

Tue 23/9

20:25-14:15

Nonstop9h 50m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 4/9

21:05-13:50

2 stops24h 45m

Seattle/Tacoma Intl

Mon 8/9

16:00-18:30

1 stop18h 30m

£480

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 9/9

06:30-18:36

2 stops20h 06m

Seattle/Tacoma Intl

Thu 2/10

10:00-11:50

2 stops17h 50m

£482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/8

09:30-16:00

1 stop14h 30m

Seattle/Tacoma Intl

Thu 21/8

17:40-15:10

1 stop13h 30m

£485

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 24/9

06:30-14:16

2 stops15h 46m

Seattle/Tacoma Intl

Sat 1/11

20:00-11:50

1 stop32h 50m

£486

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 27/8

08:15-19:58

1 stop19h 43m

Seattle/Tacoma Intl

Mon 15/9

23:40-20:45

1 stop13h 05m

£488

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 26/8

09:30-20:41

1 stop19h 11m

Seattle/Tacoma Intl

Tue 9/9

07:15-06:30

1 stop15h 15m

£495

Flights are sorted by cheapest return flights first.

Deals found on 6/7

Showing 1-10 of 45 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 £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 8 July 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 8 July 2025.

The most flights from LHR to USWA are scheduled on a Monday (22 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (16 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 8 July 2025.
Get a feel of what it's like to fly with Delta, Alaska Airlines, andAustrian Airlines 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.

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very Good

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 £407 on Aer Lingus. Other airlines that offer cheap prices include WestJet from £431 and Icelandair from £453 one-way.

  • What are the most popular routes from London Heathrow Airport to State of Washington?

  • 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 (95%), KLM (93%) and Air France (93%).

  • 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 £2,156, our data indicates the cheapest price to be £464. 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 £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

Browse thousands of different options on Cheapflights for your next trip

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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.

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 8 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£7Average£654FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£350Average£473FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£380Average£560FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£380Average£539FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£393Average£571FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£398Average£551FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£400Average£596FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£417Average£983FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£436Average£745FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£438Average£772FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

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