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Cheap flights from Washington to London 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 — LON
9 Jul — 16 Jul1
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 4 July 2025.

Round-trip from

£418

One-way from

£161

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
  • 15/9
  • 1 total stop
  • 11h 35m 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 July 2025
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Price to beat on a round-trip flight from Washington to London (LON).
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Price to beat on a one-way flight from Washington to London (LON).
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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 4 July 2025.

Sun 17/820:25SEA - LHR
Nonstop9h 50mVirgin Atlantic
Sun 24/818:30LHR - SEA
Nonstop10h 20mVirgin Atlantic
Deal found 3/7£418
Mon 15/915:45SEA - LGW
2 stops19h 30mMultiple Airlines
Mon 29/920:45LGW - SEA
3 stops31h 55mMultiple Airlines
Deal found 3/7£419
Thu 9/1019:00SEA - LHR
1 stop32h 55mIcelandair
Tue 21/1021:25LHR - SEA
1 stop28h 25mIcelandair
Deal found 2/7£420
Wed 13/807:18SEA - LHR
1 stop18h 57mDelta
Mon 1/917:25LHR - SEA
Nonstop10h 25mDelta
Deal found 2/7£421
Fri 26/915:45SEA - STN
2 stops18h 35mMultiple Airlines
Mon 6/1007:05STN - SEA
2 stops21h 35mMultiple Airlines
Deal found 2/7£421
Mon 1/916:25SEA - LCY
1 stop18h 20mSWISS
Fri 19/909:25LCY - SEA
2 stops17h 11mSWISS
Deal found 3/7£422
Mon 6/1008:00SEA - LHR
2 stops26h 40mAustrian Airlines
Wed 15/1019:30LHR - SEA
2 stops31h 19mAustrian Airlines
Deal found 1/7£422
Tue 16/920:20SEA - LHR
Nonstop9h 20mBritish Airways
Thu 2/1009:50LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 3/7£423
Sun 24/819:35SEA - LTN
1 stop17h 55mMultiple Airlines
Sun 31/809:55LTN - SEA
1 stop15h 55mMultiple Airlines
Deal found 1/7£423
Wed 13/823:30SEA - LGW
1 stop31h 10mIcelandair
Fri 5/915:40LGW - SEA
1 stop13h 00mIcelandair
Deal found 2/7£424
Thu 9/1010:00SEA - LHR
1 stop19h 20mAir Canada
Tue 21/1008:45LHR - SEA
2 stops17h 51mAir Canada
Deal found 3/7£425
Mon 4/817:40SEA - LCY
1 stop18h 00mVirgin Atlantic
Wed 20/807:45LCY - SEA
2 stops20h 23mVirgin Atlantic
Deal found 3/7£426

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 4 July 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

Sun 17/8

20:25-14:15

Nonstop9h 50m

London Heathrow

Sun 24/8

18:30-20:50

Nonstop10h 20m

£418

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 9/10

19:00-11:55

1 stop32h 55m

London Heathrow

Tue 21/10

21:25-17:50

1 stop28h 25m

£420

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 13/8

07:18-10:15

1 stop18h 57m

London Heathrow

Mon 1/9

17:25-19:50

Nonstop10h 25m

£421

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Fri 26/9

15:45-18:20

2 stops18h 35m

London Stansted

Mon 6/10

07:05-20:40

2 stops21h 35m

£421

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Mon 1/9

16:25-18:45

1 stop18h 20m

London City

Fri 19/9

09:25-18:36

2 stops17h 11m

£422

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 6/10

08:00-18:40

2 stops26h 40m

London Heathrow

Wed 15/10

19:30-18:49

2 stops31h 19m

£422

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 16/9

20:20-13:40

Nonstop9h 20m

London Heathrow

Thu 2/10

09:50-11:35

Nonstop9h 45m

£423

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Thu 24/7

15:45-21:25

2 stops21h 40m

London Gatwick

Fri 1/8

08:55-20:40

2 stops19h 45m

£423

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Sun 24/8

19:35-21:30

1 stop17h 55m

London Luton

Sun 31/8

09:55-17:50

1 stop15h 55m

£423

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 13/8

23:30-14:40

1 stop31h 10m

London Gatwick

Fri 5/9

15:40-20:40

1 stop13h 00m

£424

Flights are sorted by cheapest return flights first.

Deals found on 1/7

Showing 1-10 of 58 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 4 July 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 4 July 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).

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 4 July 2025.
Read reviews from past customers who have flown with Delta, KLM, andAustrian Airlines from Washington to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,982 reviews
Check prices

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

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

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

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

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

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

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

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

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

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

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

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 £161. WestJet flights start at £204 while deals on JetBlue start at £254 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 Seattle/Tacoma Intl - London City.

  • 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: Scandinavian Airlines (93%), KLM (92%), Air France (92%).

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

    On average you can expect to pay £1,165 for a flight from State of Washington to London. The cheapest flight overall is £309 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £308.

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

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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 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 4 July 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 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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