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Cheap flights from London to Philadelphia from £175

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 15/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PHL
4 Jan — 11 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 73 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 5 December 2025.

Thu 11/1214:45LHR - PHL
1 stop14h 14mFinnair
Sat 13/1221:20PHL - LHR
1 stop28h 40mFinnair
Deal found 1/12£543
Tue 16/1206:35LHR - PHL
2 stops14h 30mLufthansa
Thu 15/117:40PHL - LHR
1 stop14h 10mLufthansa
Deal found 2/12£549
Mon 29/1208:15LHR - PHL
1 stop12h 20mBritish Airways
Mon 12/115:35PHL - LHR
1 stop10h 25mBritish Airways
Deal found 2/12£553
Mon 29/1213:00LHR - PHL
1 stop15h 17mVirgin Atlantic
Mon 12/116:59PHL - LHR
1 stop32h 26mVirgin Atlantic
Deal found 4/12£554
Sat 27/1209:30LHR - PHL
1 stop12h 05mMultiple Airlines
Tue 17/315:30PHL - LHR
1 stop11h 40mMultiple Airlines
Deal found 3/12£561
Wed 24/1213:25LHR - PHL
1 stop30h 25mAir Canada
Wed 28/107:50PHL - LHR
2 stops18h 20mAir Canada
Deal found 4/12£561
Tue 16/1213:25LHR - PHL
2 stops38h 21mAir Canada
Thu 15/115:30PHL - LHR
2 stops48h 05mAir Canada
Deal found 2/12£562
Sat 27/1207:30LHR - PHL
1 stop14h 05mUnited Airlines
Wed 18/307:50PHL - LHR
2 stops21h 30mUnited Airlines
Deal found 3/12£563
Thu 25/1209:20LHR - PHL
1 stop13h 50mJetBlue
Fri 30/113:30PHL - LHR
1 stop12h 25mJetBlue
Deal found 4/12£564
Mon 29/1218:00LHR - PHL
2 stops25h 50mAir Canada
Mon 12/116:35PHL - LHR
2 stops33h 35mAir Canada
Deal found 3/12£566
Wed 24/1213:10LHR - PHL
Nonstop8h 05mAmerican Airlines
Mon 29/1221:15PHL - LHR
1 stop14h 05mAmerican Airlines
Deal found 2/12£567
Thu 25/1214:00LGW - PHL
1 stop14h 56mMultiple Airlines
Sun 1/222:45PHL - LGW
1 stop30h 15mMultiple Airlines
Deal found 4/12£579

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 5 December 2025.

Round-trip from

£538

One-way from

£175

Popular in

December

Cheapest in

February

Average price

£693

Good round-trip deal

£595 or less

Good one-way deal

£503 or less
British Airways
  • British Airways
  • 22/1-26/1
  • 2 total stops
  • 30h 30m total
  • London to Philadelphia
Search Deals
15/1
  • 15/1
  • 1 total stop
  • 15h 35m total
  • London to Philadelphia
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£21 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 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 5 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

STN - PHL

STNPHL

London Stansted

Sun 18/1

05:55-22:46

3 stops21h 51m

Philadelphia

Sun 25/1

15:30-20:55

2 stops24h 25m

£540

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 21/4

19:05-14:00

1 stop23h 55m

Philadelphia

Tue 28/4

22:20-10:20

Nonstop7h 00m

£544

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Fri 16/1

14:00-01:01

1 stop16h 01m

Philadelphia

Mon 6/4

17:03-15:35

2 stops17h 32m

£545

LondonPhiladelphia

STN - PHL

STNPHL

London Stansted

Wed 4/2

18:25-14:50

3 stops25h 25m

Philadelphia

Mon 9/2

15:30-22:40

2 stops26h 10m

£546

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 16/1

06:30-22:46

2 stops21h 16m

Philadelphia

Thu 2/4

09:15-06:30

2 stops16h 15m

£549

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Mon 12/1

06:50-14:05

1 stop12h 15m

Philadelphia

Tue 20/1

21:25-12:40

1 stop10h 15m

£553

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Wed 4/2

06:50-14:05

1 stop12h 15m

Philadelphia

Mon 9/2

21:25-12:40

1 stop10h 15m

£554

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 2/2

12:05-18:55

1 stop11h 50m

Philadelphia

Sun 19/4

19:45-06:55

1 stop30h 10m

£556

LondonPhiladelphia

STN - PHL

STNPHL

London Stansted

Fri 16/1

17:35-10:56

2 stops46h 21m

Philadelphia

Thu 2/4

20:30-23:20

1 stop21h 50m

£564

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Fri 6/2

16:40-18:23

2 stops30h 43m

Philadelphia

Mon 9/2

08:40-09:50

2 stops20h 10m

£564

Flights are sorted by cheapest return flights first.

Deals found on 3/12

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 28 November 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 73 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, August is the cheapest month in which you can book a flight from London to Philadelphia (average of £97). Flying from London to Philadelphia in July is currently the most expensive (average of £341). 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 5 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 5 December 2025.

The most flights from LON to PHL are scheduled on a Thursday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 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 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 £513.

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 18% of weekly flights between London and Philadelphia have experienced delays in the past year, with the average delay time being 171 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 16% 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 5 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
1,334 reviews
Check prices

Comfort

7.4

Crew

8.1

Boarding

7.6

Entertainment

6.9

Overall

7.6

Food

6.7

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
1,334 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Crew

8.1

Boarding

7.6

Entertainment

6.9

Overall

7.6

Food

6.7

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
9,065 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Crew

8.1

Boarding

7.6

Entertainment

6.9

Overall

7.6

Food

6.7

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
1,385 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Crew

8.1

Boarding

7.6

Entertainment

6.9

Overall

7.6

Food

6.7

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
3,040 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Crew

8.1

Boarding

7.6

Entertainment

6.9

Overall

7.6

Food

6.7

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
7,562 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Crew

8.1

Boarding

7.6

Entertainment

6.9

Overall

7.6

Food

6.7

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 5 flights from London to Philadelphia per day from 10 different airlines.

  • How long is the flight from London to Philadelphia?

    There are many flights that can get you from London to Philadelphia in 21h 16m. Fly via Finnair, 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 £304. Other airlines that can offer you cheap pricing are Air Canada, from £340, and JetBlue, from £393. 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?

    £360 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 £388 and £419, 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 (89%), American Airlines (85%) or Iberia (85%) 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 £400. While the most popular route (London Heathrow - Philadelphia) can be booked for £411 on average, our data indicates £823 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 £97). Flying from London to Philadelphia in July is currently the most expensive (average of £341). 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 5 December 2025.
British Airways flights from London to Philadelphia
Finnair flights from London to Philadelphia
Iberia flights from London to Philadelphia

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 5 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£304Average£410FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest£340Average£473FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
JetBlueCheapest£393Average£578FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
LufthansaCheapest£404Average£512FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£440Average£557FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£449Average£555FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£455Average£600FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Aer LingusCheapest£466Average£669FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IberiaCheapest£471Average£563FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Virgin AtlanticCheapest£480Average£524FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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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