Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Washington to London from £187

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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
18 Jun — 25 Jun1
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 13 June 2025.

Round-trip from

£488

One-way from

£187

Popular in

June

Cheapest in

January

Average price

£757

Good round-trip deal

£483 or less

Good one-way deal

£301 or less
Icelandair
  • Icelandair
  • 24/8-15/9
  • 2 total stops
  • 65h 15m total
  • Washington to London
Search Deals
Icelandair
  • Icelandair
  • 28/10
  • 1 total stop
  • 12h 20m 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).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2025
Search Deals
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 13 June 2025.

Sun 24/823:30SEA - LGW
1 stop31h 05mIcelandair
Mon 15/915:40LGW - SEA
1 stop34h 10mIcelandair
Deal found 12/6£488
Sat 25/1014:09SEA - LHR
1 stop14h 31mIberia
Sat 1/1114:10LHR - SEA
1 stop16h 40mIberia
Deal found 12/6£488
Mon 6/1020:25SEA - LHR
Nonstop9h 50mDelta
Wed 22/1017:25LHR - SEA
Nonstop10h 25mDelta
Deal found 11/6£489
Sun 24/823:30SEA - LHR
1 stop12h 50mIcelandair
Mon 15/921:25LHR - SEA
1 stop28h 25mIcelandair
Deal found 12/6£490
Wed 20/810:55SEA - LGW
2 stops23h 00mSWISS
Tue 23/918:35LGW - SEA
2 stops32h 01mSWISS
Deal found 10/6£491
Fri 11/720:25SEA - LHR
Nonstop9h 50mMultiple Airlines
Thu 24/709:55LHR - SEA
1 stop13h 55mMultiple Airlines
Deal found 10/6£491
Thu 4/919:00SEA - STN
2 stops16h 30mMultiple Airlines
Sun 7/907:15STN - SEA
2 stops21h 25mMultiple Airlines
Deal found 12/6£492
Sun 27/707:49SEA - LGW
2 stops18h 51mBritish Airways
Thu 28/810:40LGW - SEA
2 stops21h 00mBritish Airways
Deal found 10/6£492
Sat 30/820:20SEA - LHR
Nonstop9h 20mBritish Airways
Thu 11/909:50LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 12/6£492
Sun 24/816:00SEA - LHR
2 stops40h 25mScandinavian Airlines
Sat 13/910:35LHR - SEA
2 stops35h 25mScandinavian Airlines
Deal found 12/6£492
Tue 16/914:29SEA - LCY
2 stops19h 01mSWISS
Tue 7/1019:20LCY - SEA
2 stops31h 16mSWISS
Deal found 11/6£493
Sun 7/915:45SEA - LGW
2 stops20h 10mMultiple Airlines
Fri 19/908:55LGW - SEA
2 stops16h 55mMultiple Airlines
Deal found 11/6£497

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 13 June 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 - LGW

SEALGW

Seattle/Tacoma Intl

Sun 24/8

23:30-14:35

1 stop31h 05m

London Gatwick

Mon 15/9

15:40-17:50

1 stop34h 10m

£488

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 22/8

07:44-06:25

1 stop14h 41m

London Heathrow

Sun 31/8

12:15-20:02

1 stop15h 47m

£488

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 6/10

20:25-14:15

Nonstop9h 50m

London Heathrow

Wed 22/10

17:25-19:50

Nonstop10h 25m

£489

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 24/8

23:30-20:20

1 stop12h 50m

London Heathrow

Mon 15/9

21:25-17:50

1 stop28h 25m

£490

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 20/8

10:55-17:55

2 stops23h 00m

London Gatwick

Tue 23/9

18:35-18:36

2 stops32h 01m

£491

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 11/7

20:25-14:15

Nonstop9h 50m

London Heathrow

Thu 24/7

09:55-15:50

1 stop13h 55m

£491

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 27/7

07:49-10:40

2 stops18h 51m

London Gatwick

Thu 28/8

10:40-23:40

2 stops21h 00m

£492

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Thu 4/9

19:00-19:30

2 stops16h 30m

London Stansted

Sun 7/9

07:15-20:40

2 stops21h 25m

£492

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 30/8

20:20-13:40

Nonstop9h 20m

London Heathrow

Thu 11/9

09:50-11:35

Nonstop9h 45m

£492

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 24/8

16:00-16:25

2 stops40h 25m

London Heathrow

Sat 13/9

10:35-14:00

2 stops35h 25m

£492

Flights are sorted by cheapest return flights first.

Deals found on 12/6

Showing 1-10 of 60 results
1
2
3
...
6

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 13 June 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.

Weekly flight availability from State of Washington to London

Explore weekly flight availability from Washington to London. 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 13 June 2025.

The most flights from USWA to LON 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).

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 13 June 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
7,950 reviews
Check prices

Entertainment

7.9

Boarding

8.2

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
7,950 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Entertainment

7.9

Boarding

8.2

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!
Alaska Airlines
8.0
Very Good
10,000 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Entertainment

7.9

Boarding

8.2

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
1,358 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Entertainment

7.9

Boarding

8.2

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
1,290 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Entertainment

7.9

Boarding

8.2

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!
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Entertainment

7.9

Boarding

8.2

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 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 £187. WestJet flights start at £238 while deals on JetBlue start at £251 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 (92%), KLM (87%), Air France (87%).

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

    On average you can expect to pay £1,296 for a flight from State of Washington to London. The cheapest flight overall is £292 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £320.

  • 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
Deal
Hounslow
Croydon
Milton Keynes
Gatwick
Luton
Slough
Wembley
Crawley
Eastbourne
Ilford
Southend-on-Sea
Watford
Hayes
Ipswich
Winchester
Folkestone
Maidstone
Dartford
Guildford

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington to London

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Gatwick flights
Los Angeles to Heathrow flights
Boston to Heathrow flights
Dulles Intl to Heathrow flights
Newark to Gatwick flights
LaGuardia to Heathrow flights
John F Kennedy Intl to London City flights
San Francisco to Heathrow flights
O'Hare Intl to Heathrow flights
Seattle to Heathrow flights
Baltimore to Heathrow flights
Dallas/Fort Worth to Heathrow flights
LaGuardia to Gatwick flights
Boston to Gatwick flights
John F Kennedy Intl to Stansted flights
Newark to London City flights
Miami to Heathrow flights
Atlanta to Heathrow flights
Dulles Intl to Gatwick flights
Denver to Heathrow flights
Los Angeles to London City flights
Orlando to Heathrow flights
Reagan-National to Heathrow flights
Boston to London City flights
Los Angeles to Gatwick flights
Dulles Intl to London City flights
Philadelphia to Heathrow flights
Baltimore to Gatwick flights
Hobby to Heathrow flights
Reagan-National to Gatwick flights
Seattle to Gatwick flights
San Francisco to Gatwick flights
O'Hare Intl to Gatwick flights
Newark to Stansted flights
Dallas/Fort Worth to Gatwick flights
George Bush Intcntl to Heathrow flights
Detroit to Heathrow flights
Sky Harbor Intl to Heathrow flights
Minneapolis to Heathrow flights
San Francisco to London City flights
Newark to Edinburgh flights
John F Kennedy Intl to Edinburgh flights
Newark to Luton flights
Boston to Stansted flights
O'Hare Intl to London City flights
Boston to Edinburgh flights
Charlotte to Heathrow flights

Top 3 airlines flying from Washington to London

Discover the top 3 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 13 June 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£356Average£487FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£442Average£635FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£446Average£728FlexibilityNo 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 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights