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Cheap flights from Washington to London Heathrow Airport from £161

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
9 7월 — 16 7월1
1 adult

Cheap flight deals from Washington to Heathrow

Keep the following information in mind while searching for Washington to Heathrow flight deals. Data was last updated 4 7월 2025.

Round-trip from

£418

One-way from

£177

Popular in

June

Cheapest in

October

Average price

£716

Good round-trip deal

£463 or less

Good one-way deal

£367 or less
Virgin Atlantic
  • Virgin Atlantic
  • 17/8-24/8
  • Nonstop
  • 20h 10m total
  • Washington to London
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Icelandair
  • Icelandair
  • 22/10
  • 1 total stop
  • 12h 10m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£79 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Washington to London Heathrow.
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Price to beat on a one-way flight from Washington to London Heathrow.
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Find flight deals from Washington to Heathrow

Cheapest flights from Washington to Heathrow
Explore the most affordable flight options available from Washington to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 7월 2025.

일 17/820:25SEA - LHR
Nonstop9h 50mVirgin Atlantic
일 24/818:30LHR - SEA
Nonstop10h 20mVirgin Atlantic
Deal found 3/7£418
목 9/1019:00SEA - LHR
1 stop32h 55mIcelandair
화 21/1021:25LHR - SEA
1 stop28h 25mIcelandair
Deal found 2/7£420
수 13/807:18SEA - LHR
1 stop18h 57mDelta
월 1/917:25LHR - SEA
Nonstop10h 25mDelta
Deal found 2/7£421
월 6/1008:00SEA - LHR
2 stops26h 40mAustrian Airlines
수 15/1019:30LHR - SEA
2 stops31h 19mAustrian Airlines
Deal found 1/7£422
화 16/920:20SEA - LHR
Nonstop9h 20mBritish Airways
목 2/1009:50LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 3/7£423
목 9/1010:00SEA - LHR
1 stop19h 20mAir Canada
화 21/1008:45LHR - SEA
2 stops17h 51mAir Canada
Deal found 3/7£425
수 16/719:35SEA - LHR
1 stop12h 20mAer Lingus
수 6/813:25LHR - SEA
1 stop12h 25mAer Lingus
Deal found 2/7£426
수 29/1015:37SEA - LHR
2 stops19h 13mSWISS
화 11/1108:55LHR - SEA
2 stops22h 20mSWISS
Deal found 3/7£428
수 3/910:00SEA - LHR
2 stops15h 35mLufthansa
월 15/919:30LHR - SEA
2 stops26h 46mLufthansa
Deal found 2/7£432
일 17/805:10SEA - LHR
1 stop18h 15mUnited Airlines
일 24/807:25LHR - SEA
2 stops23h 34mUnited Airlines
Deal found 3/7£438
금 15/813:30SEA - LHR
1 stop12h 20mMultiple Airlines
금 22/818:00LHR - SEA
Nonstop10h 20mMultiple Airlines
Deal found 1/7£440
월 28/713:18SEA - LHR
1 stop13h 02mFinnair
월 11/810:20LHR - SEA
1 stop13h 40mFinnair
Deal found 2/7£451

Cheapflights Fare Finder

Customise your flight search to find flights from Washington to Heathrow 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 4 7월 2025.
Use the filters below to find and compare flights from Washington to London Heathrow Airport that are best for you.

Fly from

Washington

Fly to

Heathrow

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

일 17/8

20:25-14:15

Nonstop9h 50m

London Heathrow

일 24/8

18:30-20:50

Nonstop10h 20m

£418

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

목 9/10

19:00-11:55

1 stop32h 55m

London Heathrow

화 21/10

21:25-17:50

1 stop28h 25m

£420

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

수 13/8

07:18-10:15

1 stop18h 57m

London Heathrow

월 1/9

17:25-19:50

Nonstop10h 25m

£421

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

월 6/10

08:00-18:40

2 stops26h 40m

London Heathrow

수 15/10

19:30-18:49

2 stops31h 19m

£422

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

화 16/9

20:20-13:40

Nonstop9h 20m

London Heathrow

목 2/10

09:50-11:35

Nonstop9h 45m

£423

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

목 9/10

10:00-13:20

1 stop19h 20m

London Heathrow

화 21/10

08:45-18:36

2 stops17h 51m

£425

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

수 16/7

19:35-15:55

1 stop12h 20m

London Heathrow

수 6/8

13:25-17:50

1 stop12h 25m

£426

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

수 29/10

15:37-17:50

2 stops19h 13m

London Heathrow

화 11/11

08:55-23:15

2 stops22h 20m

£428

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

수 3/9

10:00-09:35

2 stops15h 35m

London Heathrow

월 15/9

19:30-14:16

2 stops26h 46m

£432

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

일 17/8

05:10-07:25

1 stop18h 15m

London Heathrow

일 24/8

07:25-22:59

2 stops23h 34m

£438

Flights are sorted by cheapest return flights first.

Deals found on 1/7

Showing 1-10 of 42 results
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Best time to book a flight from Washington to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Washington 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 Washington to London Heathrow Airport

What is the cheapest month to book a flight from State of Washington to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of £112). Flying from State of Washington to London Heathrow Airport in August is currently the most expensive (average of £164). 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 WA to LHR?

Find hourly flight availability from Washington to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 7월 2025.

When flying from State of Washington to London Heathrow Airport, 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 State of Washington to London Heathrow Airport

Explore weekly flight availability from Washington to Heathrow. 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 4 7월 2025.

The most flights from USWA to LHR are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 4 7월 2025.
Get a feel of what it's like to fly with Delta, KLM, andAustrian Airlines from Washington to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,982 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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!
Delta
8.0
Very Good
7,982 reviews
Delta
8.0
Very Good
7,982 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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!
KLM
7.8
Good
1,367 reviews
Delta
8.0
Very Good
7,982 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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!
Austrian Airlines
7.6
Good
809 reviews
Delta
8.0
Very Good
7,982 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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!
Finnair
7.6
Good
1,304 reviews
Delta
8.0
Very Good
7,982 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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!
SWISS
7.5
Good
1,654 reviews
Delta
8.0
Very Good
7,982 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

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 Washington to Heathrow. 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 State of Washington to London Heathrow Airport one-way?

    One-way options have recently been found by users for as low as £177 on Icelandair. Other airlines that offer cheap prices include WestJet from £204 and JetBlue from £254 one-way.

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

    When deciding which route to take from State of Washington to London Heathrow Airport consider Seattle/Tacoma Intl - London Heathrow, Portland - London Heathrow or Spokane - London Heathrow as they are the most popular.

  • What are the most reliable airlines from State of Washington to London Heathrow Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from State of Washington to London Heathrow Airport on time: Scandinavian Airlines (93%), KLM (92%), Air France (92%).

  • What are the cheapest flights from State of Washington to London Heathrow Airport?

    The cheapest flight price from State of Washington to London Heathrow Airport is £309. On average you can expect to pay £1,165. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £308.

  • Can I find deals for flights from Washington to Heathrow that include hotel bookings?

    Yes. In addition to deals on Washington to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Washington to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Heathrow.

  • Can I find deals for business class flights from Washington to Heathrow?

    Yes. Cheapflights offers flight deals from Washington to Heathrow 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 State of Washington to London Heathrow Airport?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of £112). Flying from State of Washington to London Heathrow Airport in August is currently the most expensive (average of £164). 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

Travelling to a place near Washington?

Book flights to Washington if you plan to visit one of these locations
Hounslow
Croydon
Milton Keynes
Deal
Northampton
Gatwick
Luton
Slough
Wembley
Crawley
Eastbourne
Ilford
Hayes
Folkestone
Southend-on-Sea
Watford
Ipswich
Winchester
Swindon
Maidstone

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Dulles Intl to London City flights
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Los Angeles to London City flights
O'Hare Intl to Gatwick flights
Newark to Stansted flights
Boston to London City flights
Los Angeles to Gatwick flights
San Francisco to Gatwick flights
Reagan-National to Gatwick flights
O'Hare Intl to London City flights
George Bush Intcntl to Heathrow flights
Seattle to Gatwick flights
San Francisco to London City flights
Newark to Luton flights
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Dallas/Fort Worth to Gatwick flights
Seattle to London City flights
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Top 3 airlines flying from Washington to Heathrow

Discover the top 3 airlines that operate flights from Washington to Heathrow. 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 4 7월 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£355Average£485FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£440Average£632FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£449Average£725FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington to Heathrow. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Heathrow from Washington.

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

Need flexible booking options for your flight to Heathrow from Washington? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Of course! You can now track prices for flights from Washington to Heathrow and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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