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Cheap flights from London to Delaware from £418

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 21/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ILG
31 Mar — 7 Apr1
1 adult

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 26 March 2025.

Round-trip from

£451

One-way from

£418

Popular in

August

Cheapest in

February

Average price

£542
Air Canada
  • Air Canada
  • 19/6-21/6
  • 2 total stops
  • 24h 03m total
  • London to Delaware
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21/5
  • 21/5
  • 2 total stops
  • 24h 05m total
  • London to Delaware
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£54 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
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Average for round-trip flights in March 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 26 March 2025.

Thu 19/609:30LHR - PHL
1 stop10h 03mAir Canada
Sat 21/616:50PHL - LHR
1 stop14h 00mAir Canada
Deal found 25/3£451
Mon 21/414:00LGW - PHL
2 stops25h 58mMultiple Airlines
Mon 28/411:40PHL - LGW
1 stop17h 20mMultiple Airlines
Deal found 25/3£455
Mon 28/407:20LHR - PHL
1 stop12h 55mAmerican Airlines
Tue 6/513:40PHL - LHR
1 stop15h 10mAmerican Airlines
Deal found 25/3£455
Wed 23/408:25LHR - PHL
1 stop17h 50mJetBlue
Wed 30/409:26PHL - LHR
1 stop16h 04mJetBlue
Deal found 25/3£456
Tue 13/509:30LHR - PHL
1 stop11h 30mMultiple Airlines
Mon 19/515:20PHL - LHR
1 stop13h 40mMultiple Airlines
Deal found 25/3£457
Mon 28/409:30LHR - PHL
1 stop11h 30mLufthansa
Mon 5/517:35PHL - LHR
1 stop11h 05mLufthansa
Deal found 24/3£461
Tue 1/409:30LHR - PHL
1 stop10h 17mUnited Airlines
Wed 16/406:15PHL - LHR
2 stops19h 05mUnited Airlines
Deal found 24/3£463
Wed 23/410:35STN - PHL
1 stop13h 25mMultiple Airlines
Fri 2/520:30PHL - STN
1 stop15h 35mMultiple Airlines
Deal found 25/3£471
Tue 22/410:05LHR - PHL
Nonstop7h 45mBritish Airways
Tue 29/414:47PHL - LHR
1 stop12h 03mBritish Airways
Deal found 25/3£471
Mon 28/408:45LCY - PHL
1 stop12h 15mLufthansa
Mon 5/517:35PHL - LCY
1 stop17h 50mLufthansa
Deal found 24/3£472
Fri 25/411:30LTN - PHL
1 stop12h 30mMultiple Airlines
Thu 1/520:30PHL - LTN
1 stop15h 05mMultiple Airlines
Deal found 25/3£475
Mon 28/408:45LCY - PHL
1 stop12h 15mMultiple Airlines
Mon 5/517:35PHL - LCY
2 stops13h 55mMultiple Airlines
Deal found 24/3£499

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 26 March 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

Thu 19/6

09:30-14:33

1 stop10h 03m

Philadelphia

Sat 21/6

16:50-11:50

1 stop14h 00m

£451

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Mon 21/4

14:00-10:58

2 stops25h 58m

Philadelphia

Mon 28/4

11:40-10:00

1 stop17h 20m

£455

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 28/4

07:20-15:15

1 stop12h 55m

Philadelphia

Tue 6/5

13:40-09:50

1 stop15h 10m

£455

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 23/4

08:25-21:15

1 stop17h 50m

Philadelphia

Wed 30/4

09:26-06:30

1 stop16h 04m

£456

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 13/5

09:30-16:00

1 stop11h 30m

Philadelphia

Mon 19/5

15:20-10:00

1 stop13h 40m

£457

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 28/4

09:30-16:00

1 stop11h 30m

Philadelphia

Mon 5/5

17:35-09:40

1 stop11h 05m

£461

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 28/4

07:25-22:33

2 stops20h 08m

Philadelphia

Mon 5/5

10:44-06:55

1 stop15h 11m

£465

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 22/4

10:05-12:50

Nonstop7h 45m

Philadelphia

Tue 29/4

14:47-07:50

1 stop12h 03m

£471

LondonPhiladelphia

STN - PHL

STNPHL

London Stansted

Wed 23/4

10:35-19:00

1 stop13h 25m

Philadelphia

Fri 2/5

20:30-17:05

1 stop15h 35m

£471

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Mon 28/4

08:45-16:00

1 stop12h 15m

Philadelphia

Mon 5/5

17:35-16:25

1 stop17h 50m

£472

Flights are sorted by cheapest return flights first.

Deals found on 24/3

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

Rainfall in Delaware by month

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

In terms of precipitation, rainfall in Delaware ranges from 73.0 - 108.0 inches per month. July is typically the wettest month, when rainfall can reach 108.0 mm. February is typically the driest time to visit Delaware when rainfall is around 73.0 mm.

Temperature in Delaware by month

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

If weather is an important factor for your trip to Delaware, 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 25.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

Reviews of airlines servicing Delaware

Get insights into the airlines that provide service to Delaware. 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 Delaware. Reviews last updated 26 March 2025.
See what other customers who have flown with Delta, KLM and Finnair from London to Delaware 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
7,891 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

8.0

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
7,891 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

8.0

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
1,318 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

8.0

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
1,266 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

8.0

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
Austrian Airlines
7.5
Good
769 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

8.0

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
1,569 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

8.0

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 Delaware. 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 Delaware one-way?

    For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as £427. Users have also found prices from £434 and £451 on WestJet and Lufthansa, 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

Browse thousands of different options on Cheapflights for your next trip

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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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