Cheap flights from London to Philadelphia from £386
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 28/9. Fares are subject to change and may not be available on all flights or dates of travel.
Cheapflights Tip: The best prices from London to Philadelphia are usually found in February or September, booked 66 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday
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 11 July 2025.
Round-trip from | £454 |
---|---|
One-way from | £386 |
Popular in | August |
Cheapest in | February |
Average price | £624 |
Good round-trip deal | £519 or less |
Good one-way deal | £673 or less |
Find flight deals from London to Philadelphia
Cheapest flights from London to PhiladelphiaExplore 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 11 July 2025.
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 11 July 2025.
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 11 July 2025.
Use the filters below to find and compare flights from London to Philadelphia that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
LondonPhiladelphia
LGW - PHL
LGWPHL
London Gatwick
Thu 11/9
14:00-00:05
1 stop15h 05m
Philadelphia
Sun 14/9
06:45-10:10
2 stops22h 25m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Wed 3/9
06:40-11:06
2 stops33h 26m
Philadelphia
Sun 7/9
07:15-17:40
2 stops29h 25m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Sat 20/9
08:25-21:24
1 stop17h 59m
Philadelphia
Wed 24/9
15:10-06:30
1 stop10h 20m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Wed 6/8
07:55-14:05
1 stop11h 10m
Philadelphia
Tue 19/8
15:55-12:15
2 stops15h 20m
LondonPhiladelphia
LGW - PHL
LGWPHL
London Gatwick
Mon 15/9
12:10-21:24
1 stop14h 14m
Philadelphia
Fri 26/9
15:10-09:35
1 stop13h 25m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Fri 29/8
08:15-16:55
2 stops37h 40m
Philadelphia
Thu 11/9
15:10-06:30
1 stop10h 20m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Thu 2/10
06:50-14:38
2 stops12h 48m
Philadelphia
Mon 13/10
15:25-09:35
1 stop13h 10m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Mon 1/9
09:30-22:07
1 stop17h 37m
Philadelphia
Tue 9/9
06:30-06:20
1 stop18h 50m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Thu 11/9
09:30-16:00
1 stop11h 30m
Philadelphia
Thu 18/9
10:10-06:55
2 stops15h 45m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Mon 15/9
10:05-13:05
Nonstop8h 00m
Philadelphia
Mon 16/2
19:45-07:50
Nonstop7h 05m
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.
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 27 June 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 66 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, March is the cheapest month in which you can book a flight from London to Philadelphia (average of £648). Flying from London to Philadelphia in July is currently the most expensive (average of £839). 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 11 July 2025.
It’s optimal to fly from London to Philadelphia in the afternoon. By choosing this option you can save up to 22% 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 Thursday afternoons when fares are most often at their lowest. Sunday mornings 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 11 July 2025.
The most flights from LON to PHL are scheduled on a Monday (15 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (10 on average).
How much does it cost for a return flight from London to Philadelphia?
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 11 July 2025.
See what other customers who have flown with Delta, Finnair, andSWISS 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.
Food
Comfort
Overall
Boarding
Entertainment
Crew
Reviews
Michael,Jul 2025
AMS - ATL
Food
Comfort
Overall
Boarding
Entertainment
Crew
Reviews
Michael,Jul 2025
AMS - ATL
Food
Comfort
Overall
Boarding
Entertainment
Crew
Reviews
Michael,Jul 2025
AMS - ATL
Food
Comfort
Overall
Boarding
Entertainment
Crew
Reviews
Michael,Jul 2025
AMS - ATL
Food
Comfort
Overall
Boarding
Entertainment
Crew
Reviews
Michael,Jul 2025
AMS - ATL
Food
Comfort
Overall
Boarding
Entertainment
Crew
Reviews
Michael,Jul 2025
AMS - ATL
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.
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 11 July 2025.
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 11 July 2025.
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.