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Cheap flights from London to Philadelphia from £376

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PHL
7 Dec — 14 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London to Philadelphia are usually found in February or September, booked 16 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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Enter your travel dates to find the best prices.

Cheapest flights from London to Philadelphia
Explore the most affordable flight options available from London to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 November 2025.

Tue 2/1212:20LHR - PHL
2 stops26h 19mIcelandair
Tue 9/1210:24PHL - LHR
1 stop15h 31mIcelandair
Deal found 5/11£473
Fri 5/1206:30STN - PHL
1 stop14h 30mMultiple Airlines
Wed 10/1217:30PHL - STN
1 stop9h 20mMultiple Airlines
Deal found 6/11£474
Mon 8/1206:00LHR - PHL
2 stops39h 05mMultiple Airlines
Mon 15/1207:50PHL - LHR
2 stops18h 20mMultiple Airlines
Deal found 6/11£474
Thu 4/1209:20LHR - PHL
1 stop17h 28mJetBlue
Mon 8/1210:24PHL - LHR
1 stop15h 31mJetBlue
Deal found 7/11£475
Wed 10/1209:20LHR - PHL
1 stop11h 17mJetBlue
Thu 8/113:30PHL - LHR
1 stop12h 25mJetBlue
Deal found 5/11£481
Thu 4/1209:20LHR - PHL
1 stop11h 17mJetBlue
Thu 11/1210:24PHL - LHR
1 stop15h 31mJetBlue
Deal found 6/11£484
Mon 8/1209:20LHR - PHL
1 stop29h 19mJetBlue
Mon 15/1216:32PHL - LHR
1 stop9h 23mJetBlue
Deal found 6/11£485
Mon 8/1213:25LHR - PHL
1 stop30h 25mAir Canada
Mon 15/1207:50PHL - LHR
2 stops18h 20mAir Canada
Deal found 6/11£486
Wed 3/1213:30LHR - PHL
1 stop31h 35mUnited Airlines
Wed 10/1216:35PHL - LHR
2 stops23h 00mUnited Airlines
Deal found 5/11£487
Wed 12/1108:50LGW - PHL
1 stop12h 10mMultiple Airlines
Wed 19/1117:30PHL - LGW
2 stops19h 20mMultiple Airlines
Deal found 5/11£489
Mon 8/1214:00LGW - PHL
1 stop33h 55mMultiple Airlines
Mon 15/1205:30PHL - LGW
1 stop23h 30mMultiple Airlines
Deal found 5/11£493
Sat 6/1209:20LHR - PHL
1 stop11h 17mJetBlue
Sat 13/1216:42PHL - LHR
1 stop9h 13mJetBlue
Deal found 6/11£493

Cheap flight deals from London to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Philadelphia (PHL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 7 November 2025.

Round-trip from

£470

One-way from

£376

Popular in

December

Cheapest in

February

Average price

£554

Good round-trip deal

£593 or less

Good one-way deal

£456 or less
2/2-6/2
  • 2/2-6/2
  • 3 total stops
  • 35h 10m total
  • London to Philadelphia
Search Deals
2/3
  • 2/3
  • 3 total stops
  • 34h 25m total
  • London to Philadelphia
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£18 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Philadelphia.
Search Deals
Price to beat on a one-way flight from London (LON) to Philadelphia.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Philadelphia 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 7 November 2025.
Use the filters below to find and compare flights from London to Philadelphia that are best for you.

Fly from

London

Fly to

Philadelphia

Route

Depart

Return

Price

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Mon 8/12

14:00-18:55

1 stop33h 55m

Philadelphia

Mon 15/12

05:30-10:00

1 stop23h 30m

£493

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 2/12

06:50-14:50

2 stops13h 00m

Philadelphia

Tue 9/12

07:50-07:10

2 stops18h 20m

£494

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 20/11

07:30-16:05

1 stop13h 35m

Philadelphia

Mon 24/11

09:20-20:35

2 stops30h 15m

£522

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Thu 11/12

08:30-18:32

2 stops39h 02m

Philadelphia

Sun 11/1

05:01-10:00

1 stop23h 59m

£525

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 4/12

13:25-15:49

2 stops31h 24m

Philadelphia

Mon 8/12

13:15-07:10

2 stops12h 55m

£529

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 5/3

09:00-22:46

2 stops18h 46m

Philadelphia

Mon 9/3

15:30-07:10

1 stop11h 40m

£533

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 2/12

07:50-13:55

1 stop11h 05m

Philadelphia

Tue 9/12

19:50-07:50

Nonstop7h 00m

£534

LondonPhiladelphia

STN - PHL

STNPHL

London Stansted

Fri 5/12

06:30-16:00

1 stop14h 30m

Philadelphia

Wed 10/12

10:24-07:50

2 stops16h 26m

£535

LondonPhiladelphia

LTN - PHL

LTNPHL

London Luton

Fri 5/12

13:05-21:48

2 stops13h 43m

Philadelphia

Wed 10/12

17:30-08:35

1 stop10h 05m

£542

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 4/12

06:30-16:05

1 stop14h 35m

Philadelphia

Thu 11/12

13:15-07:55

1 stop13h 40m

£545

Flights are sorted by cheapest return flights first.

Deals found on 6/11

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

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

How far ahead should I book a flight from London to Philadelphia?

Use this chart to determine the optimal time to book a return flight from London to Philadelphia. Price data was last updated on 31 October 2025.

The price you pay for your flight from London to Philadelphia may vary depending on when you book. For the best chance of a lower fare, look to book 16 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from London to Philadelphia?

Currently, August is the cheapest month in which you can book a flight from London to Philadelphia (average of £99). Flying from London to Philadelphia in July is currently the most expensive (average of £348). 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 PHL?

Find hourly flight availability from London to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 7 November 2025.

It’s optimal to fly from London to Philadelphia in the afternoon. By choosing this option you can save up to 9% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from London to Philadelphia?

Use this chart to determine the cheapest time to fly return from London to Philadelphia. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London to Philadelphia flight should consider departing on Tuesday at midday when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from London to Philadelphia

Explore weekly flight availability from London to Philadelphia. 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 7 November 2025.

The most flights from LON to PHL are scheduled on a Monday (10 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (7 on average).

How much does it cost for a return flight from London to Philadelphia?

What’s the top stopover airport for flights from London to Philadelphia?

Share of one-stop return flights from London to Philadelphia chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Dublin (DUB) – chosen by Cheapflights users on 41% of one-stop itineraries from London to Philadelphia on Cheapflights.

What’s the cheapest stopover airport for flights from London to Philadelphia?

Average return fare for one-stop flights from London to Philadelphia, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Boston (BOS) is the most affordable one-stop option, with an average return flight price of £520.

What’s the fastest stopover option from London to Philadelphia?

Shortest average travel time for one-stop one-way flights from London to Philadelphia, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Montreal (YUL) have the shortest average one-way travel time for one-stop routes: 11h 03m.

Which airport typically offers the quickest stopover for flights from London to Philadelphia?

Average stopover duration for one-stop one-way flights from London to Philadelphia, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Washington, D.C. (IAD) offer the fastest connection on this route, with an average stopover time of 1h 37m.

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated 7 November 2025.
See what other customers who have flown with Finnair, United Airlines, andAer Lingus from London to Philadelphia have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,335 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
United Airlines
7.4
Good
9,007 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Aer Lingus
7.2
Good
1,365 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Iberia
7.0
Good
3,007 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
British Airways
6.7
Okay
7,500 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Related info for your journey

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

  • What airport do you fly into for flights to Philadelphia from London?

    If you book a flight to Philadelphia from London, you will be flying to Philadelphia, which is the city’s only airport. Philadelphia (PHL) is located 7.0 mi from the center of Philadelphia. There are 9 flights from London to Philadelphia per day from 11 different airlines.

  • How long is the flight from London to Philadelphia?

    There are many flights that can get you from London to Philadelphia in 11h 05m. Fly via Air Canada, United Airlines, or American Airlines to get the fastest option. London and Philadelphia are separated by a distance of 3533 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London to Philadelphia round-trip?

    Cheapflights users have booked flights from London to Philadelphia round-trip from £309. Other airlines that can offer you cheap pricing are Icelandair, from £343, and Air Canada, from £346. You may be able to fly from London to Philadelphia for 45% less than the average price by searching for these airlines.

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

    £377 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on United Airlines and Virgin Atlantic, with prices starting from £381 and £394, respectively.

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

    When deciding which route to take from London to Philadelphia consider London Heathrow - Philadelphia, London Gatwick - Philadelphia or London City - Philadelphia as they are the most popular.

  • What are the most reliable airlines from London to Philadelphia?

    Consider Malaysia Airlines (86%), Iberia (80%) or British Airways (79%) when booking your flight. These represent the most reliable airlines when flying from London to Philadelphia.

  • What are the cheapest flights from London to Philadelphia?

    Looking at all options, your cheapest flight can be booked for £322. While the most popular route (London Heathrow - Philadelphia) can be booked for £434 on average, our data indicates £964 when flying from London to Philadelphia.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London to Philadelphia 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 Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from London to Philadelphia (average of £99). Flying from London to Philadelphia in July is currently the most expensive (average of £348). 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

Browse thousands of different options on Cheapflights for your next trip

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Fly from London to Philadelphia on these airlines

Choose from the following airlines for your flight from London to Philadelphia. Flights are based on user searches made on Cheapflights and were last updated on 7 November 2025.
British Airways flights from London to Philadelphia
Finnair flights from London to Philadelphia
Iberia flights from London to Philadelphia

Top 10 airlines flying from London to Philadelphia

Discover the top 10 airlines that operate flights from London to Philadelphia. 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 7 November 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£309Average£425FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IcelandairCheapest£343Average£499FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air CanadaCheapest£346Average£482FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
JetBlueCheapest£391Average£574FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
LufthansaCheapest£422Average£525FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£449Average£580FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£457Average£610FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£461Average£574FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Aer LingusCheapest£469Average£662FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IberiaCheapest£481Average£580FlexibilityNo cancel feeOn-time77%
Search Iberia 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 Philadelphia?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Philadelphia from London today with Cheapflights!

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

Cheapflights helps you find that perfect flight to Philadelphia from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to Philadelphia flexibly with Cheapflights today.

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

Of course! You can now track prices for flights from London to Philadelphia and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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