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Cheap flights from London to Philadelphia from £271

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 28/2. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PHL
17 Jan — 24 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London to Philadelphia are usually found in February or September, booked 11 days in advance, depart on a Wednesday or Tuesday 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 18 December 2025.

Mon 29/1208:15LHR - PHL
1 stop12h 20mAmerican Airlines
Mon 12/121:25PHL - LHR
1 stop12h 25mAmerican Airlines
Deal found 17/12£532
Tue 23/1219:55LHR - PHL
2 stops23h 00mBritish Airways
Wed 7/121:25PHL - LHR
1 stop11h 00mBritish Airways
Deal found 16/12£576
Wed 24/1208:25LHR - PHL
1 stop12h 10mBritish Airways
Mon 5/121:35PHL - LHR
1 stop28h 25mBritish Airways
Deal found 16/12£593
Tue 30/1213:25LHR - PHL
2 stops31h 24mAir Canada
Thu 8/115:30PHL - LHR
1 stop10h 40mAir Canada
Deal found 16/12£594
Tue 30/1206:45LHR - PHL
1 stop13h 50mMultiple Airlines
Thu 8/116:44PHL - LHR
1 stop9h 16mMultiple Airlines
Deal found 15/12£604
Mon 29/1209:20LHR - PHL
1 stop13h 50mJetBlue
Mon 12/113:30PHL - LHR
1 stop12h 25mJetBlue
Deal found 16/12£610
Mon 29/1216:30LHR - PHL
1 stop28h 05mIberia
Mon 12/121:35PHL - LHR
2 stops14h 40mIberia
Deal found 17/12£628
Sat 27/1207:50LHR - PHL
1 stop11h 05mBritish Airways
Tue 6/121:31PHL - LHR
1 stop16h 29mBritish Airways
Deal found 17/12£648
Tue 30/1206:45LHR - PHL
1 stop13h 50mBritish Airways
Thu 8/116:51PHL - LHR
1 stop14h 09mBritish Airways
Deal found 16/12£652
Wed 31/1208:40LCY - PHL
1 stop11h 55mBritish Airways
Sun 4/121:15PHL - LCY
1 stop14h 10mBritish Airways
Deal found 17/12£754
Wed 24/1206:50LCY - PHL
1 stop12h 05mBritish Airways
Sat 3/121:15PHL - LCY
1 stop11h 35mBritish Airways
Deal found 17/12£796
Mon 22/1214:00LGW - PHL
1 stop15h 40mMultiple Airlines
Fri 23/105:30PHL - LGW
1 stop23h 30mMultiple Airlines
Deal found 16/12£821

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 18 December 2025.

Round-trip from

£530

One-way from

£271

Popular in

December

Cheapest in

February

Average price

£712

Good round-trip deal

£567 or less

Good one-way deal

£429 or less
Air Canada
  • Air Canada
  • 12/1-19/1
  • 4 total stops
  • 53h 46m total
  • London to Philadelphia
Search Deals
28/2
  • 28/2
  • 2 total stops
  • 46h 38m total
  • London to Philadelphia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£26 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 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 18 December 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

LCY - PHL

LCYPHL

London City

Thu 5/2

08:40-15:35

1 stop11h 55m

Philadelphia

Mon 9/2

21:25-12:40

1 stop10h 15m

£532

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Mon 12/1

19:15-14:05

2 stops23h 50m

Philadelphia

Mon 19/1

19:55-14:35

1 stop13h 40m

£532

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 16/1

07:30-18:54

2 stops16h 24m

Philadelphia

Fri 23/1

16:35-20:35

2 stops47h 00m

£543

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 15/5

07:30-22:44

2 stops20h 14m

Philadelphia

Tue 19/5

07:10-21:00

2 stops32h 50m

£545

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 19/1

06:15-15:40

1 stop14h 25m

Philadelphia

Mon 26/1

18:35-06:35

Nonstop7h 00m

£548

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 18/3

06:50-19:09

2 stops16h 19m

Philadelphia

Sun 22/3

15:30-07:10

1 stop11h 40m

£562

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Fri 30/1

16:40-18:38

2 stops30h 58m

Philadelphia

Fri 6/2

13:30-15:45

2 stops21h 15m

£562

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 7/5

07:25-22:44

2 stops20h 19m

Philadelphia

Thu 4/6

07:10-06:30

2 stops18h 20m

£564

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Thu 22/1

07:50-15:40

1 stop12h 50m

Philadelphia

Sun 25/1

19:55-14:35

1 stop13h 40m

£565

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Fri 16/1

16:40-18:38

2 stops30h 58m

Philadelphia

Fri 23/1

13:30-15:45

2 stops21h 15m

£568

Flights are sorted by cheapest return flights first.

Deals found on 17/12

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 12 December 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 11 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 £233). Flying from London to Philadelphia in July is currently the most expensive (average of £340). 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 18 December 2025.

It’s optimal to fly from London to Philadelphia at midday. By choosing this option you can save up to 10% 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 18 December 2025.

The most flights from LON to PHL are scheduled on a Wednesday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

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 37% 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 £514.

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.

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 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?

Wednesday 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, British Airways have had the lowest number of delays on this route, with just 15% of flights being delayed.

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 18 December 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
1,338 reviews
Check prices

Comfort

7.4

Boarding

7.6

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
1,338 reviews
Finnair
7.6
Good
1,338 reviews
Check prices

Comfort

7.4

Boarding

7.6

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
9,093 reviews
Finnair
7.6
Good
1,338 reviews
Check prices

Comfort

7.4

Boarding

7.6

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
1,397 reviews
Finnair
7.6
Good
1,338 reviews
Check prices

Comfort

7.4

Boarding

7.6

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
3,053 reviews
Finnair
7.6
Good
1,338 reviews
Check prices

Comfort

7.4

Boarding

7.6

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
7,585 reviews
Finnair
7.6
Good
1,338 reviews
Check prices

Comfort

7.4

Boarding

7.6

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 7 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 16h 24m. Fly via Iberia, United Airlines, or TAP AIR PORTUGAL 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 £303. Other airlines that can offer you cheap pricing are Air Canada, from £339, and JetBlue, from £402. 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?

    £359 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 Aer Lingus and Iberia, with prices starting from £387 and £398, 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 City - Philadelphia or London Gatwick - Philadelphia as they are the most popular.

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

    Consider Malaysia Airlines (91%), Finnair (87%) or American Airlines (86%) 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 £387. While the most popular route (London Heathrow - Philadelphia) can be booked for £389 on average, our data indicates £776 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, March is the cheapest month in which you can book a flight from London to Philadelphia (average of £233). Flying from London to Philadelphia in July is currently the most expensive (average of £340). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 18 December 2025.
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 18 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£303Average£424FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest£339Average£471FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
JetBlueCheapest£402Average£605FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
LufthansaCheapest£403Average£504FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£438Average£555FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£447Average£557FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£454Average£600FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
IberiaCheapest£455Average£556FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£465Average£673FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

Fly with Cheapflights

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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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