Cheap flights from London Heathrow Airport to Philadelphia from £348
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PHL
17 Oct — 24 Oct1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Philadelphia are usually found in March or January, booked 12 days in advance, depart on a Tuesday or Monday and return on a Tuesday
Cheap flight deals from Heathrow to Philadelphia
Enter your travel dates to find the best prices.
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Best
Direct
Last-minute
One-way
Cheapest flights from Heathrow to Philadelphia
Explore the most affordable flight options available from Heathrow to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2026.
Thu 24/914:05 -
1 stop29h 42m
Thu 8/1007:00 -
1 stop18h 35m
Deal found 17/9£587
Wed 23/914:05 -
1 stop29h 42m
Thu 8/1007:00 -
1 stop18h 35m
Deal found 16/9£589
Tue 6/1006:55 -
2 stops14h 10m
Sun 18/1017:40 -
1 stop18h 00m
Deal found 16/9£590
Fri 23/1009:45 -
1 stop18h 07m
Wed 4/1118:35 -
Nonstop7h 00m
Deal found 15/9£590
Thu 19/1112:05 -
1 stop11h 46m
Sat 28/1119:40 -
1 stop10h 10m
Deal found 15/9£591
Mon 21/909:15 -
Nonstop7h 55m
Mon 28/919:35 -
Nonstop7h 15m
Deal found 14/9£592
Wed 30/913:45 -
Nonstop7h 55m
Tue 6/1018:35 -
1 stop10h 45m
Deal found 15/9£593
Tue 6/1013:25 -
1 stop10h 30m
Wed 28/1018:40 -
1 stop12h 45m
Deal found 15/9£593
Fri 23/1009:30 -
1 stop17h 02m
Mon 2/1110:54 -
1 stop14h 01m
Deal found 12/9£594
Fri 23/1009:30 -
1 stop17h 02m
Wed 28/1013:16 -
1 stop12h 39m
Deal found 13/9£595
Thu 17/1216:20 -
1 stop22h 36m
Wed 27/114:37 -
1 stop11h 03m
Deal found 12/9£596
Mon 5/1007:30 -
1 stop13h 35m
Mon 12/1010:40 -
1 stop15h 15m
Deal found 14/9£596
Best flights from Heathrow to Philadelphia
Discover carefully curated flight deals from Heathrow to Philadelphia that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 September 2026.
Wed 7/1009:30 -
1 stop11h 35m
Wed 14/1010:40 -
2 stops15h 35m
Deal found 16/9£593
Tue 6/1013:25 -
1 stop10h 30m
Wed 28/1018:40 -
1 stop12h 45m
Deal found 15/9£593
Wed 7/1009:55 -
2 stops17h 27m
Thu 29/1012:25 -
1 stop14h 25m
Deal found 14/9£638
Thu 29/1006:40 -
2 stops19h 27m
Thu 5/1111:00 -
3 stops24h 25m
Deal found 14/9£655
Wed 30/907:30 -
1 stop13h 35m
Tue 6/1011:05 -
2 stops14h 50m
Deal found 15/9£595
Tue 15/1208:50 -
1 stop12h 20m
Mon 28/1218:35 -
Nonstop7h 00m
Deal found 15/9£606
Wed 11/1107:05 -
3 stops22h 50m
Wed 18/1114:12 -
2 stops20h 48m
Deal found 14/9£655
Mon 5/1007:30 -
1 stop13h 35m
Mon 12/1010:40 -
1 stop15h 15m
Deal found 12/9£596
Sun 3/121:20 -
1 stop22h 55m
Wed 13/118:35 -
Nonstop7h 00m
Deal found 13/9£618
Fri 2/1006:50 -
2 stops16h 52m
Sun 4/1015:25 -
1 stop10h 05m
Deal found 13/9£605
Fri 2/1007:40 -
1 stop16h 15m
Sun 4/1019:35 -
Nonstop7h 15m
Deal found 13/9£648
Wed 9/1210:35 -
Nonstop8h 15m
Sun 13/1219:50 -
Nonstop7h 00m
Deal found 15/9£649
Direct flights from Heathrow to Philadelphia
Explore direct flight options from Heathrow to Philadelphia based on user searches, and compare prices and availability for your desired travel dates. Data last updated 17 September 2026.
Mon 28/909:15 -
Nonstop7h 55m
Mon 5/1022:10 -
Nonstop7h 10m
Deal found 16/9£591
Tue 8/1213:10 -
Nonstop8h 05m
Tue 15/1219:50 -
Nonstop7h 00m
Deal found 16/9£595
Mon 5/1009:15 -
Nonstop7h 55m
Mon 19/1022:10 -
Nonstop7h 10m
Deal found 16/9£596
Mon 2/1113:10 -
Nonstop8h 05m
Wed 18/1118:35 -
Nonstop7h 00m
Deal found 15/9£597
Wed 25/1113:10 -
Nonstop8h 05m
Mon 30/1118:35 -
Nonstop7h 00m
Deal found 14/9£598
Mon 28/909:15 -
Nonstop7h 55m
Mon 12/1018:45 -
Nonstop7h 05m
Deal found 14/9£601
Wed 11/1110:35 -
Nonstop8h 05m
Wed 18/1118:35 -
Nonstop7h 00m
Deal found 13/9£602
Mon 16/1113:10 -
Nonstop8h 05m
Thu 19/1118:35 -
Nonstop7h 00m
Deal found 16/9£605
Tue 2/310:35 -
Nonstop8h 15m
Wed 10/318:35 -
Nonstop7h 00m
Deal found 13/9£605
Wed 30/913:45 -
Nonstop7h 55m
Wed 28/1020:25 -
Nonstop7h 25m
Deal found 15/9£606
Tue 20/1013:45 -
Nonstop7h 55m
Thu 5/1118:35 -
Nonstop7h 00m
Deal found 16/9£607
Last-minute flights from Heathrow to Philadelphia
Discover last-minute flight deals from Heathrow to Philadelphia. Data last updated 17 September 2026 and is based on user searches.
Mon 21/909:15 -
Nonstop7h 55m
Mon 28/919:35 -
Nonstop7h 15m
Deal found 14/9£592
Wed 23/914:05 -
1 stop29h 42m
Thu 8/1007:00 -
1 stop18h 35m
Deal found 16/9£589
Mon 28/909:15 -
Nonstop7h 55m
Mon 5/1018:35 -
1 stop10h 45m
Deal found 16/9£587
Wed 30/913:45 -
Nonstop7h 55m
Tue 6/1018:35 -
1 stop10h 45m
Deal found 15/9£593
Mon 5/1007:30 -
1 stop13h 35m
Mon 12/1010:40 -
1 stop15h 15m
Deal found 14/9£596
Tue 6/1006:55 -
2 stops14h 10m
Sun 18/1017:40 -
1 stop18h 00m
Deal found 16/9£590
Tue 6/1013:25 -
1 stop10h 30m
Wed 28/1018:40 -
1 stop12h 45m
Deal found 15/9£593
Fri 23/1009:45 -
1 stop18h 07m
Wed 4/1118:35 -
Nonstop7h 00m
Deal found 15/9£590
Fri 23/1009:30 -
1 stop17h 02m
Mon 2/1110:54 -
1 stop14h 01m
Deal found 12/9£594
Sat 24/1008:00 -
1 stop16h 24m
Wed 28/1018:46 -
1 stop13h 14m
Deal found 12/9£596
One-way flights from Heathrow to Philadelphia
Search for one-way flight options from Heathrow to Philadelphia. Find affordable one-way fares based on user searches. Data last updated 17 September 2026.
Sat 31/1008:05 -
2 stops37h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 12/9£348
Mon 9/1120:50 -
3 stops48h 20m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 16/9£350
Sun 14/318:35 -
2 stops26h 35m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 13/9£350
Tue 27/1020:50 -
3 stops54h 53m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£353
Fri 13/1120:50 -
3 stops24h 20m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 16/9£355
Thu 10/1221:05 -
3 stops48h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 16/9£356
Sun 15/1120:50 -
3 stops48h 20m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 15/9£358
Thu 12/1121:05 -
3 stops48h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 14/9£364
Sun 8/1120:50 -
3 stops24h 20m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 12/9£364
Wed 25/1120:50 -
3 stops48h 20m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 13/9£365
Find flight deals from Heathrow to Philadelphia
Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) 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 17 September 2026.
Customise your flight search to find flights from Heathrow 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 7,457,451 searches. Data last updated 17 September 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Philadelphia that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest return flight
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Wed 18/11
06:30-14:00
1 stop12h 30m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£403
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Mon 2/11
09:20-17:08
1 stop12h 48m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£408
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Tue 10/11
09:20-17:08
1 stop12h 48m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£409
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Wed 9/12
09:20-18:43
1 stop14h 23m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£413
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Thu 17/12
07:30-16:05
1 stop13h 35m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£432
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Thu 29/10
06:30-17:05
1 stop14h 35m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£455
Fastest return journey
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Mon 14/12
13:10-16:15
Nonstop8h 05m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£470
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Sat 14/11
13:10-16:15
Nonstop8h 05m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£479
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Sat 12/12
13:10-16:15
Nonstop8h 05m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£510
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Fri 9/10
08:40-18:28
1 stop14h 48m
Philadelphia
Wed 31/12
00:00-06:00
Nonstop0h 00m
£526
Flights are sorted by cheapest return flights first.
Deals found on 13/9
Showing 1-10 of 24 resultsSorted by cheapest first
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Best time to book a flight from Heathrow to Philadelphia
Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Heathrow with our price prediction graph.
LHR-PHL
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 Heathrow Airport to Philadelphia
Prices
Airlines
Delays
More
How far ahead should I book a flight from London Heathrow Airport to Philadelphia?
To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Philadelphia, you should look to book at least 11 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from London Heathrow Airport to Philadelphia?
Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Philadelphia (average of £560). Flying from London Heathrow Airport to Philadelphia in August is currently the most expensive (average of £861). 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 LHR to PHL?
Find hourly flight availability from Heathrow 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 17 September 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to Philadelphia as you normally would.
How much does it cost for a return flight from London Heathrow Airport to Philadelphia?
Airfare is typical for this route at the moment.
London Heathrow Airport to Philadelphia flights typically cost between £567 and £692 in September.The cheapest return price found within the last 5 days was £587 on British Airways (28 Sept–5 Oct).
Weekly flight availability from London Heathrow Airport to Philadelphia
Explore weekly flight availability from Heathrow 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 17 September 2026.
The most flights from LHR 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 (14 on average).
How often are flights from London to Philadelphia delayed?
About 16% of weekly flights between London and Philadelphia have experienced delays in the past year, with the average delay time being 156 minutes.
What is the most punctual flight time for London to Philadelphia flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on London to Philadelphia flights?
Over the past year, American Airlines have had the lowest number of delays on this route, with just 13% of flights being delayed.
What’s the top stopover airport for flights from London Heathrow Airport to Philadelphia?
Share of one-stop return flights from London Heathrow Airport to Philadelphia chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Dublin (DUB) – chosen by Cheapflights users on 71% of one-stop itineraries from London Heathrow Airport to Philadelphia on Cheapflights.
What’s the cheapest stopover airport for flights from London Heathrow Airport to Philadelphia?
Average return fare for one-stop flights from London Heathrow Airport to Philadelphia, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Montreal (YUL) is the most affordable one-stop option, with an average return flight price of £506.
What’s the fastest stopover option from London Heathrow Airport to Philadelphia?
Shortest average travel time for one-stop one-way flights from London Heathrow Airport 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: 10h 08m.
Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Philadelphia?
Average stopover duration for one-stop one-way flights from London Heathrow Airport to Philadelphia, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Montreal (YUL) offer the fastest connection on this route, with an average stopover time of 2h 13m.
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 17 September 2026.
Get a feel of what it's like to fly with Finnair,Aer Lingus, andAmerican Airlines from London Heathrow Airport to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
baggage allowance was different between the outgoing and inbound flights
Related info for your journey
Find useful and relevant information for your journey from Heathrow 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 Heathrow?
Most people fly into Philadelphia (PHL) if they book a flight to Philadelphia from London Heathrow. On average, Philadelphia has 14 inbound flights from London Heathrow per day from 7 airlines. Philadelphia is conveniently located just 7.0 mi from Philadelphia’s city center.
How long is the flight from London Heathrow Airport to Philadelphia?
Airlines like United Airlines and British Airways fly from London Heathrow Airport to Philadelphia in about 10h 30m. The time it takes to get you to your destination can typically vary by up to 1h 05m. The distance between London Heathrow Airport and Philadelphia is about 3533 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from London Heathrow Airport to Philadelphia round-trip?
Our cheapest airline available from London Heathrow Airport to Philadelphia is JetBlue. Our recent data shows that you can find tickets from as low as £418 on this airline. Additional options worth looking into are Finnair and Aer Lingus, starting at £460 and £463 round-trip. JetBlue is currently priced 37% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from London Heathrow Airport to Philadelphia one-way?
The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as £396. However, be on the lookout for offers from Finnair and Aer Lingus, as they are both options that can get you from London Heathrow Airport to Philadelphia for a low price.
What are the most reliable airlines from London Heathrow Airport to Philadelphia?
Consider Malaysia Airlines (84%), American Airlines (77%) or Finnair (77%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Philadelphia.
What are the cheapest flights from London Heathrow Airport to Philadelphia?
The cheapest flight price from London Heathrow Airport to Philadelphia is £447. On average you can expect to pay £1,612. The most popular route, (London Heathrow - Philadelphia), can usually be booked for £471.
Can I find deals for business class flights from Heathrow to Philadelphia?
Yes. Cheapflights offers flight deals from Heathrow 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 Heathrow Airport to Philadelphia?
Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Philadelphia (average of £560). Flying from London Heathrow Airport to Philadelphia in August is currently the most expensive (average of £861). 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.
Book flights to Philadelphia if you plan to visit one of these locations
King of Prussia
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Fly from Heathrow to Philadelphia on these airlines
Choose from the following airlines for your flight from Heathrow to Philadelphia. Flights are based on user searches made on Cheapflights and were last updated on 17 September 2026.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 17 September 2026.
Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 17 September 2026.
Top 7 airlines flying from Heathrow to Philadelphia
Discover the top 7 airlines that operate flights from Heathrow 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 7,457,451 searches. Data last updated 17 September 2026.
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 Heathrow to Philadelphia?
When you search for this flight from Heathrow to Philadelphia, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Why should you use Cheapflights to find cheap flight tickets from Heathrow to Philadelphia?
Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Philadelphia 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 Heathrow to Philadelphia with no change fees?
Need flexible booking options for your flight to Philadelphia from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.
Can Cheapflights notify me if prices for flights from Heathrow to Philadelphia become cheaper?
Yes! Start tracking prices for Heathrow to Philadelphia 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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