Cheap flights from London Heathrow Airport to Philadelphia from £347
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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PHL
21 Sep — 28 Sep1
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 November, booked 12 days in advance, depart on a Tuesday or Monday and return on a Tuesday
Cheap flight deals from Heathrow to Philadelphia
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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 22 August 2026.
Wed 23/907:30 -
1 stop13h 35m
Sun 27/910:50 -
2 stops53h 10m
Deal found 17/8£575
Mon 5/1007:30 -
1 stop13h 35m
Mon 12/1007:00 -
2 stops33h 00m
Deal found 18/8£576
Mon 19/1009:30 -
1 stop11h 35m
Wed 4/1119:40 -
2 stops30h 30m
Deal found 18/8£577
Mon 14/912:00 -
1 stop11h 55m
Mon 21/920:25 -
1 stop9h 45m
Deal found 17/8£577
Tue 22/907:30 -
2 stops36h 17m
Sun 27/910:50 -
2 stops29h 10m
Deal found 18/8£578
Tue 15/907:30 -
2 stops18h 57m
Sun 20/907:00 -
2 stops33h 00m
Deal found 18/8£580
Sat 3/1006:40 -
2 stops19h 59m
Sat 10/1011:00 -
2 stops26h 30m
Deal found 19/8£580
Fri 11/909:50 -
1 stop14h 05m
Mon 21/920:25 -
1 stop9h 45m
Deal found 18/8£581
Tue 29/906:40 -
2 stops20h 41m
Tue 20/1012:25 -
2 stops15h 55m
Deal found 17/8£583
Tue 13/1007:30 -
1 stop13h 35m
Tue 3/1119:40 -
2 stops30h 30m
Deal found 20/8£583
Tue 15/913:00 -
Nonstop8h 00m
Tue 22/917:49 -
1 stop32h 51m
Deal found 18/8£585
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 22 August 2026.
Mon 5/1007:30 -
2 stops18h 59m
Mon 12/1007:00 -
2 stops33h 00m
Deal found 21/8£583
Wed 7/1007:05 -
3 stops20h 02m
Wed 21/1009:20 -
2 stops27h 20m
Deal found 16/8£589
Wed 11/1106:30 -
1 stop12h 35m
Wed 18/1119:50 -
Nonstop7h 00m
Deal found 17/8£618
Sun 13/907:30 -
2 stops43h 02m
Sun 20/907:00 -
2 stops33h 00m
Deal found 16/8£593
Wed 11/1107:05 -
3 stops22h 50m
Wed 18/1115:33 -
2 stops19h 27m
Deal found 18/8£625
Sun 22/1107:30 -
2 stops19h 08m
Thu 3/1209:15 -
2 stops19h 05m
Deal found 17/8£609
Fri 9/1007:25 -
2 stops16h 59m
Mon 12/1007:00 -
2 stops18h 30m
Deal found 21/8£612
Tue 22/909:30 -
1 stop10h 17m
Sun 27/910:40 -
2 stops14h 50m
Deal found 18/8£618
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 22 August 2026.
Wed 30/913:00 -
Nonstop8h 00m
Wed 28/1019:35 -
Nonstop7h 00m
Deal found 18/8£595
Mon 26/1013:10 -
Nonstop8h 05m
Mon 2/1119:50 -
Nonstop7h 00m
Deal found 17/8£610
Sun 13/909:15 -
Nonstop7h 55m
Sun 20/919:35 -
Nonstop7h 15m
Deal found 16/8£610
Tue 15/913:00 -
Nonstop8h 00m
Sun 20/922:10 -
Nonstop7h 10m
Deal found 18/8£611
Wed 7/1013:00 -
Nonstop8h 00m
Wed 21/1022:10 -
Nonstop7h 10m
Deal found 17/8£613
Mon 21/913:45 -
Nonstop7h 55m
Mon 28/919:35 -
Nonstop7h 15m
Deal found 19/8£618
Tue 15/913:45 -
Nonstop7h 55m
Wed 30/922:10 -
Nonstop7h 10m
Deal found 18/8£620
Mon 5/1013:00 -
Nonstop8h 00m
Mon 12/1022:10 -
Nonstop7h 10m
Deal found 21/8£621
Mon 14/909:15 -
Nonstop7h 55m
Mon 21/922:10 -
Nonstop7h 10m
Deal found 16/8£621
Last-minute flights from Heathrow to Philadelphia
Discover last-minute flight deals from Heathrow to Philadelphia. Data last updated 22 August 2026 and is based on user searches.
Fri 11/909:50 -
1 stop14h 05m
Mon 21/920:25 -
1 stop9h 45m
Deal found 18/8£581
Mon 14/912:00 -
1 stop11h 55m
Mon 21/920:25 -
1 stop9h 45m
Deal found 17/8£577
Tue 15/907:30 -
2 stops18h 57m
Sun 20/907:00 -
2 stops33h 00m
Deal found 18/8£580
Tue 15/913:00 -
Nonstop8h 00m
Tue 22/917:49 -
1 stop32h 51m
Deal found 18/8£585
Wed 16/914:10 -
2 stops24h 33m
Wed 30/911:20 -
2 stops14h 55m
Deal found 19/8£587
Wed 16/909:30 -
1 stop11h 35m
Wed 30/915:25 -
1 stop13h 35m
Deal found 19/8£588
Thu 17/906:40 -
2 stops23h 00m
Mon 28/909:25 -
2 stops28h 05m
Deal found 19/8£586
Sat 19/906:40 -
2 stops23h 00m
Sat 26/907:10 -
2 stops21h 10m
Deal found 20/8£588
Tue 22/907:30 -
2 stops36h 17m
Sun 27/910:50 -
2 stops29h 10m
Deal found 18/8£578
Wed 23/907:30 -
1 stop13h 35m
Sun 27/910:50 -
2 stops53h 10m
Deal found 17/8£575
Tue 29/906:40 -
2 stops20h 41m
Tue 20/1012:25 -
2 stops15h 55m
Deal found 17/8£583
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 22 August 2026.
Fri 9/1008:45 -
2 stops15h 10m
Deal found 19/8£347
Fri 16/1008:45 -
2 stops15h 10m
Deal found 18/8£349
Wed 18/1120:50 -
3 stops24h 10m
Deal found 19/8£352
Sun 29/1120:50 -
3 stops48h 10m
Deal found 17/8£354
Tue 13/1020:50 -
3 stops27h 05m
Deal found 20/8£358
Mon 19/1008:45 -
2 stops15h 10m
Deal found 20/8£362
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 22 August 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 22 August 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
Mon 5/10
07:30-21:29
2 stops18h 59m
Philadelphia
Mon 12/10
07:00-21:00
2 stops33h 00m
£583
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Wed 7/10
07:05-22:07
3 stops20h 02m
Philadelphia
Wed 21/10
09:20-17:40
2 stops27h 20m
£589
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Sun 13/9
07:30-21:32
2 stops43h 02m
Philadelphia
Sun 20/9
07:00-21:00
2 stops33h 00m
£593
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Sun 22/11
07:30-21:38
2 stops19h 08m
Philadelphia
Thu 3/12
09:15-09:20
2 stops19h 05m
£609
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Fri 9/10
07:25-19:24
2 stops16h 59m
Philadelphia
Mon 12/10
07:00-06:30
2 stops18h 30m
£612
Fastest return journey
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Wed 11/11
06:30-14:05
1 stop12h 35m
Philadelphia
Wed 18/11
19:50-07:50
Nonstop7h 00m
£618
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Tue 22/9
09:30-14:47
1 stop10h 17m
Philadelphia
Sun 27/9
10:40-06:30
2 stops14h 50m
£618
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Wed 11/11
07:05-00:55
3 stops22h 50m
Philadelphia
Wed 18/11
15:33-16:00
2 stops19h 27m
£625
Cheapest one-way
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Sat 14/11
09:20-22:36
1 stop18h 16m
£404
LondonPhiladelphia
LHR London Heathrow - PHL Philadelphia
LHRPHL
London Heathrow
Fri 11/9
08:40-17:48
1 stop14h 08m
£407
Flights are sorted by cheapest return flights first.
Deals found on 18/8
Showing 1-10 of 18 resultsSorted by cheapest first
1
2
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 £549). Flying from London Heathrow Airport to Philadelphia in August is currently the most expensive (average of £843). 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 22 August 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 below average for this route at the moment.
London Heathrow Airport to Philadelphia flights typically cost between £621 and £802 in September.The cheapest return price found within the last 5 days was £575 on United Airlines (23 Sept–27 Sept).
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 22 August 2026.
The most flights from LHR to PHL are scheduled on a Monday (15 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (15 on average).
How often are flights from London to Philadelphia delayed?
About 17% of weekly flights between London and Philadelphia have experienced delays in the past year, with the average delay time being 162 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 15% 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 67% 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 £499.
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 22 August 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 15 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 Scandinavian Airlines fly from London Heathrow Airport to Philadelphia in about 18h 59m. The time it takes to get you to your destination can typically vary by up to 1h 03m. 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 £412 on this airline. Additional options worth looking into are Finnair and Aer Lingus, starting at £446 and £456 round-trip. JetBlue is currently priced 36% 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 Aer Lingus, with whom users have recently found tickets for as low as £344. However, be on the lookout for offers from British Airways and Finnair, 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 (89%), American Airlines (83%) or Finnair (83%) 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 £397. On average you can expect to pay £1,720. The most popular route, (London Heathrow - Philadelphia), can usually be booked for £467.
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 £549). Flying from London Heathrow Airport to Philadelphia in August is currently the most expensive (average of £843). 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 22 August 2026.
Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 22 August 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 22 August 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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