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Cheap flights from London to Washington from £383

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 17/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
25 Feb — 4 Mar1
1 adult

Cheap flight deals from London to Washington

Keep the following information in mind while searching for London to Washington flight deals. Data was last updated 20 February 2025.

Round-trip from

£414

One-way from

£383

Popular in

August

Cheapest in

January

Average price

£525

Good round-trip deal

£512 or less

Good one-way deal

£556 or less
Icelandair
  • Icelandair
  • 21/4-29/4
  • 2 total stops
  • 40h 35m total
  • London to Washington
Search Deals
17/3
  • 17/3
  • 2 total stops
  • 27h 17m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£87 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£15 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Washington.
Search Deals
Price to beat on a one-way flight from London (LON) to Washington.
Search Deals

Find flight deals from London to Washington

Cheapest flights from London to Washington
Explore the most affordable flight options available from London to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 February 2025.

Mon 21/421:25LHR - SEA
1 stop28h 25mIcelandair
Tue 29/415:45SEA - LHR
1 stop12h 10mIcelandair
Deal found 19/2£414
Tue 18/311:55LGW - SEA
1 stop13h 05mIcelandair
Tue 25/315:35SEA - LGW
1 stop12h 20mIcelandair
Deal found 19/2£423
Thu 6/309:30LHR - SEA
2 stops44h 00mUnited Airlines
Sun 9/319:05SEA - LHR
1 stop32h 05mUnited Airlines
Deal found 19/2£453
Fri 21/307:40LHR - SEA
1 stop13h 40mLufthansa
Fri 28/315:05SEA - LHR
1 stop12h 05mLufthansa
Deal found 19/2£457
Tue 11/308:55LHR - SEA
2 stops19h 35mAir Canada
Tue 18/305:55SEA - LHR
2 stops18h 15mAir Canada
Deal found 18/2£469
Tue 11/308:55LHR - SEA
2 stops20h 58mSWISS
Tue 18/314:50SEA - LHR
2 stops21h 25mSWISS
Deal found 19/2£470
Mon 17/306:30LHR - SEA
1 stop13h 40mMultiple Airlines
Wed 2/419:05SEA - LHR
2 stops30h 55mMultiple Airlines
Deal found 19/2£475
Tue 11/309:25LHR - SEA
Nonstop9h 55mBritish Airways
Tue 1/420:20SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 19/2£483
Mon 17/319:35LHR - SEA
1 stop23h 45mVirgin Atlantic
Wed 2/417:35SEA - LHR
Nonstop9h 50mVirgin Atlantic
Deal found 19/2£484
Mon 21/417:25LHR - SEA
Nonstop10h 20mKLM
Tue 29/411:24SEA - LHR
1 stop15h 36mKLM
Deal found 19/2£487
Tue 22/409:25LHR - SEA
Nonstop9h 45mIberia
Wed 30/420:20SEA - LHR
Nonstop9h 20mIberia
Deal found 19/2£488
Mon 3/306:30LHR - SEA
1 stop13h 07mDelta
Mon 17/318:45SEA - LHR
Nonstop9h 25mDelta
Deal found 19/2£492

Find flights from London to Washington within your budget

Customise your flight search to find flights from London to Washington 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 20 February 2025.

Fly from

London

Fly to

Washington

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

21:25-17:50

1 stop28h 25m

Seattle/Tacoma Intl

Tue 29/4

15:45-11:55

1 stop12h 10m

£414

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 18/3

11:55-18:00

1 stop13h 05m

Seattle/Tacoma Intl

Tue 25/3

15:35-10:55

1 stop12h 20m

£423

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 6/3

09:30-21:30

2 stops44h 00m

Seattle/Tacoma Intl

Sun 9/3

19:05-10:10

1 stop32h 05m

£453

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 21/3

07:40-14:20

1 stop13h 40m

Seattle/Tacoma Intl

Fri 28/3

15:05-10:10

1 stop12h 05m

£457

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/3

08:55-21:30

2 stops19h 35m

Seattle/Tacoma Intl

Tue 18/3

05:55-07:10

2 stops18h 15m

£469

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/3

08:55-22:53

2 stops20h 58m

Seattle/Tacoma Intl

Tue 18/3

14:50-19:15

2 stops21h 25m

£470

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 17/3

06:30-13:10

1 stop13h 40m

Seattle/Tacoma Intl

Wed 2/4

19:05-10:00

2 stops30h 55m

£475

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/3

09:25-12:20

Nonstop9h 55m

Seattle/Tacoma Intl

Tue 1/4

20:20-13:40

Nonstop9h 20m

£483

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 17/3

19:35-12:20

1 stop23h 45m

Seattle/Tacoma Intl

Wed 2/4

17:35-11:25

Nonstop9h 50m

£484

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

17:25-19:45

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 29/4

11:24-11:00

1 stop15h 36m

£487

Flights are sorted by cheapest return flights first.

Deals found on 19/2

Showing 1-10 of 60 results
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Best time to book a flight from London to Washington

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

Travel insights for flights from London to Washington

Get recent, data-driven insights about flights from London to Washington including ideal travel times, pricing trends, and more.

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

Currently, January is the cheapest month in which you can book a flight from London to State of Washington (average of £622). Flying from London to State of Washington in July is currently the most expensive (average of £946). 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 LON to WA?

Find hourly flight availability from London to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 February 2025.

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

Explore weekly flight availability from London to Washington. 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 20 February 2025.

The most flights from LON to USWA are scheduled on a Friday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Washington by month

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

In terms of precipitation, rainfall in State of Washington ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit State of Washington when rainfall is around 18.0 mm.

Temperature in Washington by month

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

If weather is an important factor for your trip to State of Washington, 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 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated 20 February 2025.
See what other customers who have flown with Delta, Air New Zealand and KLM from London to Washington have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
8,220 reviews
Check prices

Comfort

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very Good
8,220 reviews
Delta
8.0
Very Good
8,220 reviews
Check prices

Comfort

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Air New Zealand
7.9
Good
461 reviews
Delta
8.0
Very Good
8,220 reviews
Check prices

Comfort

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very Good
8,220 reviews
Check prices

Comfort

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair
7.6
Good
1,274 reviews
Delta
8.0
Very Good
8,220 reviews
Check prices

Comfort

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS
7.5
Good
1,568 reviews
Delta
8.0
Very Good
8,220 reviews
Check prices

Comfort

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from London to Washington. 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 London to State of Washington one-way?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at £389. Aer Lingus flights start at £417 while deals on Icelandair start at £458 one-way.

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

    While some choose either London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl, London Heathrow - Seattle/Tacoma Intl is the most popular route from London to State of Washington.

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

    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 London to State of Washington on time: Singapore Airlines (97%), KLM (89%), Air France (89%).

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

    On average you can expect to pay £1,272 for a flight from London to State of Washington. The cheapest flight overall is £419 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £411.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from London to State of Washington (average of £622). Flying from London to State of Washington in July is currently the most expensive (average of £946). 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

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Alternative routes for London to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from London to Washington

Discover the top 10 airlines that operate flights from London to Washington. 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 20 February 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£347Average£545FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
DeltaCheapest£368Average£882FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£411Average£618FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£425Average£617FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£432Average£682FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£438Average£673FlexibilityNo cancel feeOn-time75%
Search KLM flights
Aer LingusCheapest£439Average£691FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
FinnairCheapest£442Average£723FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air CanadaCheapest£444Average£592FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£461Average£955FlexibilityNo 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 London to Washington?

Deals for London to Washington flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from London to Washington by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

Yes, we can. To see specific flights from London to Washington with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Yes! Start tracking prices for London to Washington flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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