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Cheap flights from Washington to London Heathrow Airport from £209

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 6/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
3 Apr — 10 Apr1
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 29 March 2025.

Round-trip from

£455

One-way from

£209

Popular in

June

Cheapest in

October

Average price

£531

Good round-trip deal

£577 or less

Good one-way deal

£323 or less
Icelandair
  • Icelandair
  • 1/5-12/5
  • 2 total stops
  • 48h 35m total
  • Washington to London
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Icelandair
  • Icelandair
  • 6/6
  • 1 total stop
  • 12h 50m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£126 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 29 March 2025.

Thu 1/519:00SEA - LHR
1 stop17h 20mIcelandair
Mon 12/521:25LHR - SEA
1 stop31h 15mIcelandair
Deal found 28/3£455
Mon 26/516:00SEA - LHR
2 stops17h 00mScandinavian Airlines
Tue 10/621:05LHR - SEA
2 stops24h 45mScandinavian Airlines
Deal found 28/3£464
Wed 30/415:20PDX - LHR
1 stop21h 00mIcelandair
Wed 7/513:05LHR - PDX
1 stop12h 50mIcelandair
Deal found 28/3£469
Wed 7/515:45SEA - LHR
2 stops21h 50mMultiple Airlines
Sun 11/506:50LHR - SEA
2 stops19h 00mMultiple Airlines
Deal found 28/3£471
Tue 29/413:30SEA - LHR
Nonstop9h 20mFinnair
Wed 7/510:20LHR - SEA
1 stop13h 40mFinnair
Deal found 29/3£508
Sun 4/506:15PDX - LHR
2 stops21h 35mMultiple Airlines
Wed 14/520:05LHR - PDX
2 stops30h 40mMultiple Airlines
Deal found 28/3£516
Wed 30/420:20SEA - LHR
Nonstop9h 20mAmerican Airlines
Thu 15/510:20LHR - SEA
1 stop13h 40mAmerican Airlines
Deal found 29/3£516
Sun 21/919:25PDX - LHR
Nonstop9h 35mBritish Airways
Tue 30/915:40LHR - PDX
Nonstop9h 55mBritish Airways
Deal found 28/3£517
Tue 16/907:00PDX - LHR
2 stops18h 35mScandinavian Airlines
Tue 23/910:20LHR - PDX
2 stops19h 58mScandinavian Airlines
Deal found 28/3£519
Sun 27/411:40PDX - LHR
1 stop18h 30mUnited Airlines
Tue 6/506:30LHR - PDX
2 stops16h 10mUnited Airlines
Deal found 28/3£521
Tue 29/413:30SEA - LHR
Nonstop9h 20mIberia
Tue 13/509:25LHR - SEA
Nonstop9h 45mIberia
Deal found 28/3£522
Sat 4/1019:40PDX - LHR
1 stop33h 40mAir Canada
Tue 14/1006:00LHR - PDX
2 stops24h 56mAir Canada
Deal found 28/3£524

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 29 March 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

Thu 1/5

19:00-20:20

1 stop17h 20m

London Heathrow

Mon 12/5

21:25-20:40

1 stop31h 15m

£455

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 26/5

16:00-17:00

2 stops17h 00m

London Heathrow

Tue 10/6

21:05-13:50

2 stops24h 45m

£464

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 30/4

15:20-20:20

1 stop21h 00m

London Heathrow

Wed 7/5

13:05-17:55

1 stop12h 50m

£469

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 7/5

15:45-21:35

2 stops21h 50m

London Heathrow

Sun 11/5

06:50-17:50

2 stops19h 00m

£471

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 28/4

13:30-06:50

Nonstop9h 20m

London Heathrow

Wed 7/5

09:30-16:00

1 stop14h 30m

£516

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 4/5

06:15-11:50

2 stops21h 35m

London Heathrow

Wed 14/5

20:05-18:45

2 stops30h 40m

£516

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 21/9

19:25-13:00

Nonstop9h 35m

London Heathrow

Tue 30/9

15:40-17:35

Nonstop9h 55m

£517

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 27/4

17:35-11:20

Nonstop9h 45m

London Heathrow

Tue 13/5

20:55-11:40

1 stop22h 45m

£517

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 29/4

10:10-13:20

1 stop19h 10m

London Heathrow

Tue 6/5

06:30-18:45

2 stops20h 15m

£518

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 16/9

07:00-09:35

2 stops18h 35m

London Heathrow

Tue 23/9

10:20-22:18

2 stops19h 58m

£519

Flights are sorted by cheapest return flights first.

Deals found on 28/3

Showing 1-10 of 60 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 29 March 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.

Rainfall in Heathrow by month

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

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

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

If weather is an important factor for your trip to London Heathrow Airport, 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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 29 March 2025.
Read reviews from past customers who have flown Delta, Alaska Airlines and KLM from Washington to London. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,895 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very Good
7,895 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Alaska Airlines
8.0
Very Good
9,798 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,570 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 £209 on Icelandair. Other airlines that offer cheap prices include Scandinavian Airlines from £304 and WestJet from £308 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: Aeromexico (80%), Singapore Airlines (80%), American Airlines (73%).

  • 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 £301. On average you can expect to pay £513. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £418.

  • 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
Deal
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Gatwick
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Wembley
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Swindon
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Winchester
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Ipswich
Watford
Southall

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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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Top 4 airlines flying from Washington to Heathrow

Discover the top 4 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 29 March 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£374Average£514FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£464Average£735FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£473Average£887FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£511Average£826FlexibilityNo cancel feeOn-time75%
Search KLM 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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