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Cheap flights from London to Delaware from £354

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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ILG
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheap flight deals from London to Delaware

Keep the following information in mind while searching for London to Delaware flight deals. Data was last updated 18 September 2025.

Round-trip from

£435

One-way from

£354

Popular in

August

Cheapest in

February

Average price

£489
United Airlines
  • United Airlines
  • 27/11-4/12
  • 2 total stops
  • 27h 15m total
  • London to Delaware
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10/11
  • 10/11
  • 1 total stop
  • 12h 30m total
  • London to Delaware
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£30 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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Find flight deals from London to Delaware

Cheapest flights from London to Delaware
Explore the most affordable flight options available from London to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Thu 27/1108:30LHR - PHL
1 stop12h 30mUnited Airlines
Thu 4/1215:05PHL - LHR
1 stop14h 45mUnited Airlines
Deal found 17/9£435
Fri 31/1006:35LHR - PHL
2 stops18h 46mUnited Airlines
Fri 7/1110:05PHL - LHR
2 stops15h 35mUnited Airlines
Deal found 16/9£436
Wed 19/1109:50LGW - PHL
2 stops27h 57mMultiple Airlines
Sat 6/1210:46PHL - LGW
1 stop18h 19mMultiple Airlines
Deal found 16/9£437
Sat 1/1106:35LHR - PHL
2 stops16h 30mUnited Airlines
Sat 8/1112:40PHL - LHR
2 stops13h 00mUnited Airlines
Deal found 17/9£437
Fri 28/1113:30LHR - PHL
2 stops14h 26mMultiple Airlines
Wed 3/1213:15PHL - LHR
2 stops12h 55mMultiple Airlines
Deal found 16/9£438
Mon 6/1014:00LGW - PHL
1 stop27h 53mMultiple Airlines
Wed 8/1005:20PHL - LGW
2 stops20h 00mMultiple Airlines
Deal found 16/9£438
Mon 29/907:45LHR - PHL
2 stops16h 12mUnited Airlines
Mon 6/1010:32PHL - LHR
2 stops16h 48mUnited Airlines
Deal found 16/9£439
Thu 13/1114:00LGW - PHL
1 stop22h 30mMultiple Airlines
Tue 2/1221:11PHL - LGW
2 stops27h 49mMultiple Airlines
Deal found 17/9£439
Fri 21/1106:50LHR - PHL
2 stops12h 57mAir Canada
Sun 30/1115:30PHL - LHR
2 stops14h 50mAir Canada
Deal found 16/9£440
Thu 18/1206:00STN - PHL
1 stop15h 00mMultiple Airlines
Sun 28/1217:30PHL - STN
1 stop9h 20mMultiple Airlines
Deal found 17/9£440
Wed 24/907:45LHR - PHL
2 stops16h 10mUnited Airlines
Tue 30/910:32PHL - LHR
2 stops14h 58mUnited Airlines
Deal found 17/9£440
Mon 29/914:00LGW - PHL
1 stop29h 18mMultiple Airlines
Mon 6/1021:55PHL - LGW
2 stops31h 05mMultiple Airlines
Deal found 16/9£440

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Delaware 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 18 September 2025.
Use the filters below to find and compare flights from London to Delaware that are best for you.

Fly from

London

Fly to

Delaware

Route

Depart

Return

Price

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 25/2

06:50-14:47

2 stops12h 57m

Philadelphia

Mon 9/3

15:30-07:10

1 stop11h 40m

£436

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 1/11

06:35-19:05

2 stops16h 30m

Philadelphia

Sat 8/11

15:00-10:50

1 stop14h 50m

£437

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 5/11

08:30-21:21

2 stops17h 51m

Philadelphia

Tue 11/11

10:34-05:55

2 stops14h 21m

£437

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sun 2/11

07:30-19:05

2 stops16h 35m

Philadelphia

Sun 9/11

10:34-05:55

2 stops14h 21m

£439

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 29/9

07:45-18:57

2 stops16h 12m

Philadelphia

Mon 6/10

13:05-11:45

1 stop17h 40m

£439

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 29/9

07:45-18:57

2 stops16h 12m

Philadelphia

Sat 11/10

15:00-10:10

2 stops14h 10m

£439

LondonPhiladelphia

STN - PHL

STNPHL

London Stansted

Thu 18/12

06:00-16:00

1 stop15h 00m

Philadelphia

Sun 28/12

17:30-07:50

1 stop9h 20m

£440

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Mon 29/9

14:00-14:18

1 stop29h 18m

Philadelphia

Mon 6/10

21:55-10:00

2 stops31h 05m

£440

LondonPhiladelphia

STN - PHL

STNPHL

London Stansted

Sat 1/11

06:30-17:00

1 stop14h 30m

Philadelphia

Sat 8/11

17:30-07:50

1 stop9h 20m

£442

LondonPhiladelphia

LTN - PHL

LTNPHL

London Luton

Sat 1/11

06:00-17:00

1 stop15h 00m

Philadelphia

Sat 8/11

17:30-07:35

1 stop9h 05m

£442

Flights are sorted by cheapest return flights first.

Deals found on 17/9

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

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

Cheapflights Insights

Everything you need to know about your flight from London to Delaware
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from London to Delaware. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London to Delaware?

    Air Canada, United Airlines, and British Airways can get you from London to Delaware in just under 12h 57m. Your travel time can differ by up to 10h 33m. London and Delaware are separated by a distance of 3533 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from London to Delaware one-way?

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as £355. Users have also found prices from £357 and £358 on American Airlines and Iberia, respectively.

  • What are the most popular routes from London to Delaware?

    The most popular route from London to Delaware is London Heathrow - Philadelphia. You may also consider London Gatwick - Philadelphia or London City - Philadelphia.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London to Delaware by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for London to Delaware

See prices for flight routes from nearby airports that may be better suited for you.
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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 Delaware?

Deals for London to Delaware 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 Delaware?

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

Certainly. Search results for flights to Delaware from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

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

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