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Cheap flights from London Heathrow Airport to Washington from £336

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 25/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
12 May — 19 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 12 April 2026.

Fri 24/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Sat 9/519:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 7/4£489
Fri 8/513:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Fri 22/523:25
SEA
-
LHR
1 stop12h 55m
Icelandair
Deal found 7/4£489
Wed 6/513:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Fri 22/523:25
SEA
-
LHR
1 stop12h 55m
Icelandair
Deal found 8/4£492
Thu 3/921:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Thu 17/915:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 8/4£492
Mon 20/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Fri 24/419:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 7/4£493
Wed 1/721:25
LHR
-
SEA
1 stop22h 20m
Icelandair
Thu 1/1019:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 8/4£495
Sun 26/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Mon 11/515:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 7/4£497
Thu 14/513:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Wed 27/523:25
SEA
-
LHR
1 stop12h 55m
Icelandair
Deal found 8/4£498
Sat 25/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Sat 2/519:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 8/4£500
Tue 5/513:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Tue 12/519:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 7/4£501
Wed 13/513:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Thu 21/523:25
SEA
-
LHR
1 stop28h 30m
Icelandair
Deal found 9/4£501
Wed 6/513:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Wed 13/519:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 8/4£503

Find flight deals from Heathrow to Washington

Keep the following information in mind while searching for Heathrow to Washington flight deals. Data was last updated 12 April 2026.

Round-trip from

£483

One-way from

£336

Popular in

July

Cheapest in

February

Average price

£537

Good round-trip deal

£627 or less

Good one-way deal

£528 or less
Icelandair
  • Icelandair
  • 8/10-15/10
  • 2 total stops
  • 25h 05m total
  • London to Washington
Search Deals
WestJet
  • WestJet
  • 25/4
  • 1 total stop
  • 31h 40m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£53 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
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 12 April 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 12/6

06:30-16:24

1 stop17h 54m

Seattle/Tacoma Intl

Mon 22/6

22:05-15:35

Nonstop9h 30m

£546

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 11/6

11:45-16:24

1 stop12h 39m

Seattle/Tacoma Intl

Sun 5/7

18:20-12:10

Nonstop9h 50m

£567

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 12/6

09:55-16:24

1 stop14h 29m

Seattle/Tacoma Intl

Mon 22/6

22:05-15:35

Nonstop9h 30m

£570

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/5

13:10-00:36

1 stop19h 26m

Seattle/Tacoma Intl

Tue 2/6

20:20-13:45

Nonstop9h 25m

£600

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 18/6

06:30-11:37

1 stop13h 07m

Seattle/Tacoma Intl

Fri 26/6

18:20-12:10

Nonstop9h 50m

£602

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 9/5

08:40-11:42

1 stop35h 02m

Seattle/Tacoma Intl

Wed 3/6

22:35-20:10

1 stop13h 35m

£605

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 9/5

06:30-20:43

2 stops22h 13m

Seattle/Tacoma Intl

Tue 2/6

07:15-06:20

1 stop15h 05m

£610
Fastest return journey

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 2/7

17:45-20:03

Nonstop10h 18m

Seattle/Tacoma Intl

Sat 1/8

18:20-12:10

Nonstop9h 50m

£615

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 4/6

06:30-11:37

1 stop13h 07m

Seattle/Tacoma Intl

Thu 11/6

20:10-14:00

Nonstop9h 50m

£615

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 6/5

07:25-18:32

2 stops19h 07m

Seattle/Tacoma Intl

Wed 13/5

07:00-07:15

2 stops16h 15m

£620

Flights are sorted by cheapest return flights first.

Deals found on 7/4

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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, February is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £365). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £510). 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 12 April 2026.

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 12 April 2026.

The most flights from LHR to USWA are scheduled on a Monday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 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 12 April 2026.
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
7.8
Good
1,496 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.8

Entertainment

7.1

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.8
Good
1,496 reviews
KLM
7.8
Good
1,496 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.8

Entertainment

7.1

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Virgin Atlantic
7.5
Good
685 reviews
KLM
7.8
Good
1,496 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.8

Entertainment

7.1

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Air France
7.4
Good
1,566 reviews
KLM
7.8
Good
1,496 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.8

Entertainment

7.1

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Icelandair
7.0
Good
632 reviews
KLM
7.8
Good
1,496 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.8

Entertainment

7.1

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
British Airways
6.7
Okay
7,875 reviews
KLM
7.8
Good
1,496 reviews
Check prices

Food

7.3

Comfort

7.7

Overall

7.8

Entertainment

7.1

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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, KLM, and British Airways can get you from London Heathrow Airport to State of Washington in just under 12h 39m. Your travel time can differ by up to 6h 47m. 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 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 £352 on Icelandair. Other airlines that offer cheap prices include British Airways from £369 and Aer Lingus from £386 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 - Pasco Tri Cities 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 KLM (96%), Delta (94%) and Virgin Atlantic (94%).

  • 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 £1,730, our data indicates the cheapest price to be £413. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £468.

  • 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to State of Washington (average of £365). Flying from London Heathrow Airport to State of Washington in July is currently the most expensive (average of £510). 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 12 April 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£333Average£540FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£340Average£462FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£416Average£669FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£426Average£614FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£429Average£610FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£440Average£633FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£447Average£625FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air FranceCheapest£449Average£642FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£460Average£668FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air CanadaCheapest£462Average£496FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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

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Why should you use Cheapflights to find cheap flight tickets from Heathrow to Washington?

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Washington for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Heathrow to Washington with no change fees?

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

Can Cheapflights notify me if prices for flights from Heathrow to Washington become cheaper?

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