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Cheap flights from Washington to London 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 — LON
3 Apr — 10 Apr1
1 adult

Cheap flight deals from Washington to London

Keep the following information in mind while searching for Washington to London 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 (LON).
Search Deals
Price to beat on a one-way flight from Washington to London (LON).
Search Deals

Find flight deals from Washington to London

Cheapest flights from Washington to London
Explore the most affordable flight options available from Washington to London. 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 19/519:00SEA - LGW
1 stop11h 35mMultiple Airlines
Tue 3/620:55LGW - SEA
2 stops31h 33mMultiple Airlines
Deal found 27/3£458
Wed 7/519:00SEA - LGW
1 stop11h 40mIcelandair
Fri 16/515:40LGW - SEA
1 stop13h 00mIcelandair
Deal found 28/3£459
Mon 26/516:00SEA - LHR
2 stops17h 00mScandinavian Airlines
Tue 10/621:05LHR - SEA
2 stops24h 45mScandinavian Airlines
Deal found 28/3£464
Wed 7/515:20PDX - LGW
1 stop12h 25mIcelandair
Mon 12/515:40LGW - PDX
1 stop34h 15mIcelandair
Deal found 28/3£467
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
Wed 7/515:45SEA - STN
2 stops22h 30mMultiple Airlines
Wed 14/506:10STN - SEA
2 stops19h 40mMultiple Airlines
Deal found 27/3£478
Wed 28/516:00SEA - LTN
2 stops20h 45mMultiple Airlines
Sun 15/609:55LTN - SEA
2 stops35h 55mMultiple Airlines
Deal found 28/3£501
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

Cheapflights Fare Finder

Customise your flight search to find flights from Washington to London 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 that are best for you.

Fly from

Washington

Fly to

London

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 - LGW

SEALGW

Seattle/Tacoma Intl

Mon 19/5

19:00-14:35

1 stop11h 35m

London Gatwick

Tue 3/6

20:55-20:28

2 stops31h 33m

£458

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 7/5

19:00-14:40

1 stop11h 40m

London Gatwick

Fri 16/5

15:40-20:40

1 stop13h 00m

£459

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 - LGW

PDXLGW

Portland

Wed 7/5

15:20-11:45

1 stop12h 25m

London Gatwick

Mon 12/5

15:40-17:55

1 stop34h 15m

£467

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 - STN

SEASTN

Seattle/Tacoma Intl

Wed 7/5

15:45-22:15

2 stops22h 30m

London Stansted

Wed 14/5

06:10-17:50

2 stops19h 40m

£478

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 29/4

13:30-06:50

Nonstop9h 20m

London Heathrow

Wed 7/5

09:30-16:00

1 stop14h 30m

£508

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 30/4

20:20-13:40

Nonstop9h 20m

London Heathrow

Wed 7/5

10:20-16:00

1 stop13h 40m

£516

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 London

Have a flexible travel schedule? Discover the best time to fly to London 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

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

Currently, January is the cheapest month in which you can book a flight from State of Washington to London (average of £112). Flying from State of Washington to London 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 LON?

Find hourly flight availability from Washington to London. 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, 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 London by month

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

In terms of precipitation, rainfall in London 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 when rainfall is around 40.0 mm.

Temperature in London by month

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

If weather is an important factor for your trip to London, 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 London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 29 March 2025.
Peruse reviews from past customers who have flown with Delta, Alaska Airlines and KLM from Washington to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,895 reviews
Check prices

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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 London. 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 one-way?

    To fly one-way, consider booking your trip with Icelandair, which is currently one of the cheapest options available, starting at £209. WestJet flights start at £304 while deals on Scandinavian Airlines start at £304 one-way.

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

    The most popular route from State of Washington to London is Seattle/Tacoma Intl - London Heathrow. You may also consider Seattle/Tacoma Intl - London Gatwick or Portland - London Heathrow.

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

    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 on time: Aeromexico (80%), Singapore Airlines (80%), American Airlines (73%).

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

    On average you can expect to pay £513 for a flight from State of Washington to London. The cheapest flight overall is £301 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £423.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to London 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?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to London (average of £112). Flying from State of Washington to London 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
Milton Keynes
Gatwick
Croydon
Luton
Slough
Eastbourne
Wembley
Hayes
Ilford
Crawley
Southend-on-Sea
Winchester
Maidstone
Ipswich
Watford
Southall
Dartford
Folkestone

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to London

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 London

Discover the top 4 airlines that operate flights from Washington to London. 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 London?

When you search for this flight from Washington to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Washington to London 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 Washington to London with no change fees?

Yes! Cheapflights helps users easily find flights from Washington to London with no change fees.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to London from Washington today and book when prices fit your budget.

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