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Cheap flights from London to Philadelphia from £343

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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PHL
9 Jul — 16 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Philadelphia are usually found in September or January, booked 12 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from London to Philadelphia

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 9 June 2026.

Thu 18/614:05
LHR
-
PHL
1 stop12h 29m
Lufthansa
Wed 24/610:05
PHL
-
LHR
2 stops17h 30m
Lufthansa
Deal found 8/6£632
Thu 8/1012:00
STN
-
PHL
1 stop11h 55m
Multiple Airlines
Mon 12/1020:25
PHL
-
STN
1 stop11h 25m
Multiple Airlines
Deal found 9/6£633
Fri 10/709:15
LCY
-
PHL
1 stop11h 50m
Multiple Airlines
Sun 26/717:40
PHL
-
LCY
2 stops13h 55m
Multiple Airlines
Deal found 8/6£633
Thu 18/609:15
LHR
-
PHL
Nonstop7h 55m
British Airways
Tue 30/615:28
PHL
-
LHR
1 stop11h 32m
British Airways
Deal found 8/6£633
Thu 9/714:00
LGW
-
PHL
1 stop15h 51m
Multiple Airlines
Mon 13/716:40
PHL
-
LGW
2 stops36h 20m
Multiple Airlines
Deal found 9/6£633
Thu 3/910:35
LGW
-
PHL
2 stops26h 03m
TAP AIR PORTUGAL
Wed 18/1110:30
PHL
-
LGW
3 stops42h 30m
TAP AIR PORTUGAL
Deal found 8/6£633
Thu 18/614:05
LHR
-
PHL
1 stop12h 29m
Air Canada
Wed 24/606:00
PHL
-
LHR
2 stops21h 35m
Air Canada
Deal found 9/6£634
Thu 18/609:15
LHR
-
PHL
Nonstop7h 55m
Iberia
Wed 24/619:20
PHL
-
LHR
Nonstop7h 30m
Iberia
Deal found 9/6£635
Tue 6/1007:50
LHR
-
PHL
1 stop12h 55m
Iberia
Sat 17/1022:20
PHL
-
LHR
Nonstop7h 00m
Iberia
Deal found 9/6£636
Sat 10/1013:45
LHR
-
PHL
Nonstop7h 55m
American Airlines
Tue 13/1018:50
PHL
-
LHR
1 stop10h 20m
American Airlines
Deal found 9/6£638
Fri 10/709:15
LHR
-
PHL
Nonstop8h 00m
British Airways
Thu 16/717:30
PHL
-
LHR
1 stop9h 30m
British Airways
Deal found 9/6£639
Thu 13/808:30
STN
-
PHL
1 stop15h 25m
Multiple Airlines
Tue 18/820:25
PHL
-
STN
1 stop16h 10m
Multiple Airlines
Deal found 8/6£639

Find 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 9 June 2026.

Round-trip from

£633

One-way from

£343

Popular in

June

Cheapest in

September

Average price

£717

Good round-trip deal

£631 or less

Good one-way deal

£453 or less
8/10-12/10
  • 8/10-12/10
  • 2 total stops
  • 23h 20m total
  • London to Philadelphia
Search Deals
JetBlue
  • JetBlue
  • 1/9
  • 1 total stop
  • 16h 20m total
  • London to Philadelphia
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£54 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
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 9 June 2026.
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

Cheapest return flight
Fastest return journey

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sun 11/10

13:45-16:40

Nonstop7h 55m

Philadelphia

Wed 14/10

22:20-10:20

Nonstop7h 00m

£640

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Thu 29/10

10:40-09:39

2 stops26h 59m

Philadelphia

Fri 6/11

18:30-08:20

3 stops32h 50m

£640

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Tue 1/9

19:15-16:05

2 stops25h 50m

Philadelphia

Tue 15/9

11:04-08:40

2 stops16h 36m

£645

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Fri 4/9

17:15-18:55

1 stop30h 40m

Philadelphia

Tue 8/9

18:30-19:55

1 stop20h 25m

£648

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Thu 5/11

06:50-14:05

1 stop12h 15m

Philadelphia

Tue 10/11

20:40-12:20

1 stop10h 40m

£649

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Mon 7/9

09:25-17:54

2 stops37h 29m

Philadelphia

Thu 17/9

11:04-08:25

2 stops16h 21m

£651

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 8/10

13:45-16:40

Nonstop7h 55m

Philadelphia

Sun 18/10

22:20-10:20

Nonstop7h 00m

£655

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 8/10

13:45-16:40

Nonstop7h 55m

Philadelphia

Sat 17/10

22:20-10:20

Nonstop7h 00m

£655

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 2/7

07:45-23:20

2 stops20h 35m

Philadelphia

Thu 9/7

10:39-05:55

2 stops14h 16m

£656

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Tue 23/6

14:30-20:22

1 stop34h 52m

Philadelphia

Sat 27/6

19:54-10:40

1 stop33h 46m

£659

Flights are sorted by cheapest return flights first.

Deals found on 5/6

Showing 1-10 of 60 resultsSorted by cheapest first
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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

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 £253). Flying from London to Philadelphia in July is currently the most expensive (average of £1,446). 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 9 June 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Philadelphia as you normally would.

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 9 June 2026.

The most flights from LON 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 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.

Boston (BOS) – chosen by Cheapflights users on 46% 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.

Barcelona (BCN) is the most affordable one-stop option, with an average return flight price of £478.

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: 10h 08m.

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 Frankfurt am Main (FRA) offer the fastest connection on this route, with an average stopover time of 1h 18m.

How often are flights from London to Philadelphia delayed?

About 18% of weekly flights between London and Philadelphia have experienced delays in the past year, with the average delay time being 174 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 18% of flights being delayed.

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

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 11 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 9 June 2026.
See what other customers who have flown with Finnair,Aer Lingus, andAmerican Airlines 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
7.7
Good
1,405 reviews
Check prices

Crew

8.2

Entertainment

6.9

Boarding

7.7

Overall

7.7

Comfort

7.4

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

HEL - KAO

It’s a small plane with minimal service and luggage space
Finnair
7.7
Good
1,405 reviews
Finnair
7.7
Good
1,405 reviews
Check prices

Crew

8.2

Entertainment

6.9

Boarding

7.7

Overall

7.7

Comfort

7.4

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

HEL - KAO

It’s a small plane with minimal service and luggage space
Aer Lingus
7.3
Good
1,599 reviews
Finnair
7.7
Good
1,405 reviews
Check prices

Crew

8.2

Entertainment

6.9

Boarding

7.7

Overall

7.7

Comfort

7.4

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

HEL - KAO

It’s a small plane with minimal service and luggage space
American Airlines
7.1
Good
11,640 reviews
Finnair
7.7
Good
1,405 reviews
Check prices

Crew

8.2

Entertainment

6.9

Boarding

7.7

Overall

7.7

Comfort

7.4

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

HEL - KAO

It’s a small plane with minimal service and luggage space
JetBlue
7.1
Good
2,980 reviews
Finnair
7.7
Good
1,405 reviews
Check prices

Crew

8.2

Entertainment

6.9

Boarding

7.7

Overall

7.7

Comfort

7.4

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

HEL - KAO

It’s a small plane with minimal service and luggage space
British Airways
6.7
Okay
8,031 reviews
Finnair
7.7
Good
1,405 reviews
Check prices

Crew

8.2

Entertainment

6.9

Boarding

7.7

Overall

7.7

Comfort

7.4

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

HEL - KAO

It’s a small plane with minimal service and luggage space

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 15 flights from London to Philadelphia per day from 9 different airlines.

  • How long is the flight from London to Philadelphia?

    There are many flights that can get you from London to Philadelphia in 7h 55m. Fly via British Airways, TAP AIR PORTUGAL, or SWISS 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 £390. Other airlines that can offer you cheap pricing are JetBlue, from £421, and Air Canada, from £437. You may be able to fly from London to Philadelphia for 37% less than the average price by searching for these airlines.

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

    £326 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on Aer Lingus and British Airways, with prices starting from £391 and £399, 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 (87%), American Airlines (83%) or Finnair (83%) 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 £366. While the most popular route (London Heathrow - Philadelphia) can be booked for £467 on average, our data indicates £961 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 £253). Flying from London to Philadelphia in July is currently the most expensive (average of £1,446). 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 9 June 2026.
British Airways flights from London to Philadelphia
Finnair flights from London to Philadelphia
Iberia flights from London to Philadelphia

Top 9 airlines flying from London to Philadelphia

Discover the top 9 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 9 June 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£390Average£570FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
JetBlueCheapest£421Average£604FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Air CanadaCheapest£437Average£489FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£447Average£597FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£458Average£609FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£464Average£586FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Aer LingusCheapest£466Average£696FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
American AirlinesCheapest£467Average£664FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
IberiaCheapest£494Average£647FlexibilityNo 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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