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Cheap flights from Philadelphia to London from £140

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 20/1. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — LON
5 Dec — 12 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Philadelphia to London are usually found in September or August, booked 88 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Philadelphia to London

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to London (LON). 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 November 2025.

Round-trip from

£428

One-way from

£140

Popular in

June

Cheapest in

September

Average price

£538

Good round-trip deal

£646 or less
11/12-11/1
  • 11/12-11/1
  • 2 total stops
  • 54h 27m total
  • Philadelphia to London
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20/1
  • 20/1
  • 2 total stops
  • 29h 00m total
  • Philadelphia to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£111 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Philadelphia to London (LON).
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Find flight deals from Philadelphia to London

Enter your travel dates to find the best prices.

Cheapest flights from Philadelphia to London
Explore the most affordable flight options available from Philadelphia to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 November 2025.

Thu 11/1222:00PHL - LGW
1 stop31h 00mMultiple Airlines
Sun 11/114:10LGW - PHL
1 stop23h 27mMultiple Airlines
Deal found 4/11£428
Mon 1/1215:30PHL - STN
3 stops21h 50mMultiple Airlines
Mon 8/1221:45STN - PHL
3 stops22h 05mMultiple Airlines
Deal found 3/11£429
Mon 1/1215:30PHL - LGW
3 stops20h 50mMultiple Airlines
Mon 8/1221:30LGW - PHL
3 stops22h 20mMultiple Airlines
Deal found 3/11£429
Wed 3/1215:30PHL - LGW
3 stops24h 35mMultiple Airlines
Tue 9/1221:40LGW - PHL
3 stops22h 10mMultiple Airlines
Deal found 4/11£433
Wed 3/1215:30PHL - LHR
1 stop10h 40mMultiple Airlines
Wed 10/1209:00LHR - PHL
2 stops17h 10mMultiple Airlines
Deal found 3/11£435
Tue 18/1109:20PHL - STN
2 stops28h 00mMultiple Airlines
Tue 25/1121:45STN - PHL
2 stops30h 01mMultiple Airlines
Deal found 3/11£436
Wed 3/1215:30PHL - STN
3 stops26h 20mMultiple Airlines
Mon 8/1221:45STN - PHL
3 stops22h 05mMultiple Airlines
Deal found 3/11£438
Wed 3/1215:30PHL - LGW
3 stops24h 35mMultiple Airlines
Mon 8/1217:55LGW - PHL
3 stops25h 55mMultiple Airlines
Deal found 3/11£438
Sun 9/1115:30PHL - LHR
1 stop10h 40mAir Canada
Tue 18/1106:50LHR - PHL
2 stops12h 57mAir Canada
Deal found 3/11£438
Sun 9/1117:30PHL - LGW
1 stop17h 05mMultiple Airlines
Sun 16/1108:25LGW - PHL
1 stop12h 35mMultiple Airlines
Deal found 3/11£441
Wed 19/1106:15PHL - LGW
2 stops18h 45mMultiple Airlines
Thu 20/1114:00LGW - PHL
1 stop14h 03mMultiple Airlines
Deal found 5/11£443
Fri 12/1205:30PHL - LGW
1 stop23h 30mMultiple Airlines
Sun 11/114:10LGW - PHL
1 stop23h 27mMultiple Airlines
Deal found 4/11£444

Cheapflights Fare Finder

 
Customise your flight search to find flights from Philadelphia to London 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 November 2025.
Use the filters below to find and compare flights from Philadelphia to London that are best for you.

Fly from

Philadelphia

Fly to

London

Route

Depart

Return

Price

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 2/2

11:22-09:20

2 stops16h 58m

London Heathrow

Thu 5/2

06:40-22:52

2 stops21h 12m

£457

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 25/11

15:30-07:10

1 stop10h 40m

London Heathrow

Tue 2/12

12:05-22:46

2 stops39h 41m

£467

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 3/12

15:30-07:10

1 stop10h 40m

London Heathrow

Tue 9/12

07:30-16:05

1 stop13h 35m

£470

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 10/12

10:15-07:10

2 stops15h 55m

London Heathrow

Thu 25/12

06:50-23:30

2 stops21h 40m

£473

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 3/3

14:31-11:40

1 stop16h 09m

London Heathrow

Tue 10/3

06:30-19:12

2 stops16h 42m

£480

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 2/12

18:35-06:35

Nonstop7h 00m

London Heathrow

Tue 9/12

13:10-16:15

Nonstop8h 05m

£483

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 3/12

18:35-06:35

Nonstop7h 00m

London Heathrow

Tue 9/12

13:10-16:15

Nonstop8h 05m

£483

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 30/12

18:35-06:35

Nonstop7h 00m

London Heathrow

Fri 16/1

13:10-16:15

Nonstop8h 05m

£483

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 10/2

11:22-16:25

3 stops24h 03m

London Heathrow

Mon 16/2

06:40-00:22

2 stops22h 42m

£484

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 1/12

15:30-07:10

1 stop10h 40m

London Heathrow

Mon 15/12

11:30-16:05

1 stop33h 35m

£484

Flights are sorted by cheapest return flights first.

Deals found on 2/11

Showing 1-10 of 60 results
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Best time to book a flight from Philadelphia to London

Have a flexible travel schedule? Discover the best time to fly to London from Philadelphia 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 Philadelphia to London

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

Use this chart to determine the optimal time to book a return flight from Philadelphia to London. Price data was last updated on 31 October 2025.

The price you pay for your flight from Philadelphia to London may vary depending on when you book. For the best chance of a lower fare, look to book 88 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 Philadelphia to London?

Currently, February is the cheapest month in which you can book a flight from Philadelphia to London (average of £184). Flying from Philadelphia to London in June is currently the most expensive (average of £408). 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 PHL to LON?

Find hourly flight availability from Philadelphia to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 November 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 50% on flights from Philadelphia to London by exploring options for tickets at midday.

Weekly flight availability from Philadelphia to London

Explore weekly flight availability from Philadelphia to London. 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 November 2025.

The most flights from PHL to LON are scheduled on a Monday (10 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (3 on average).

How much does it cost for a return flight from Philadelphia to London?

What’s the top stopover airport for flights from Philadelphia to London?

Share of one-stop return flights from Philadelphia to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Boston (BOS) – chosen by Cheapflights users on 68% of one-stop itineraries from Philadelphia to London on Cheapflights.

What’s the cheapest stopover airport for flights from Philadelphia to London?

Average return fare for one-stop flights from Philadelphia to London, 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 £474.

What’s the fastest stopover option from Philadelphia to London?

Shortest average travel time for one-stop one-way flights from Philadelphia to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 9h 48m.

Which airport typically offers the quickest stopover for flights from Philadelphia to London?

Average stopover duration for one-stop one-way flights from Philadelphia to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Dublin (DUB) offer the fastest connection on this route, with an average stopover time of 1h 41m.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 5 November 2025.
Read reviews from past customers who have flown with American Airlines, JetBlue, andAer Lingus from Philadelphia to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,039 reviews
Check prices

Entertainment

6.9

Food

6.4

Boarding

7.5

Overall

7.2

Comfort

7.2

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.
American Airlines
7.2
Good
11,039 reviews
American Airlines
7.2
Good
11,039 reviews
Check prices

Entertainment

6.9

Food

6.4

Boarding

7.5

Overall

7.2

Comfort

7.2

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.
JetBlue
7.2
Good
2,908 reviews
American Airlines
7.2
Good
11,039 reviews
Check prices

Entertainment

6.9

Food

6.4

Boarding

7.5

Overall

7.2

Comfort

7.2

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.
Aer Lingus
7.2
Good
1,365 reviews
American Airlines
7.2
Good
11,039 reviews
Check prices

Entertainment

6.9

Food

6.4

Boarding

7.5

Overall

7.2

Comfort

7.2

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.
Iberia
7.0
Good
3,007 reviews
American Airlines
7.2
Good
11,039 reviews
Check prices

Entertainment

6.9

Food

6.4

Boarding

7.5

Overall

7.2

Comfort

7.2

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.
British Airways
6.7
Okay
7,495 reviews
American Airlines
7.2
Good
11,039 reviews
Check prices

Entertainment

6.9

Food

6.4

Boarding

7.5

Overall

7.2

Comfort

7.2

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to London. 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 from for flights from Philadelphia to London?

    Located just 7.0 mi from the city center, Philadelphia is the airport most travelers will use when flying to London from Philadelphia. Booking flights from Philadelphia (PHL) to London should be relatively easy as there are 6 daily outbound flights to London from 5 different airlines.

  • How long is the flight from Philadelphia to London?

    For as low as £470, Scandinavian Airlines can have you in London from Philadelphia in 10h 40m. There are 3533 mi between Philadelphia and London. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from Philadelphia to London round-trip?

    Flying on British Airways is currently your cheapest option to London, with prices starting at £394. Additional return tickets that might be worth considering are offered by Aer Lingus and JetBlue, with the lowest prices starting at £402 and £438, respectively. British Airways is currently priced 34% below the average price you’ll pay for this route.

  • What are the most popular routes from Philadelphia to London?

    The most popular route from Philadelphia to London is Philadelphia - London Heathrow. You may also consider Philadelphia - London Gatwick or Philadelphia - London City.

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

    Consider Malaysia Airlines (83%), Iberia (82%) or British Airways (81%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to London.

  • What are the cheapest flights from Philadelphia to London?

    Looking for the cheapest flight from Philadelphia to London? While on average our users pay £689, our data indicates the cheapest price to be £499. The most popular route (Philadelphia - London Heathrow), is priced around £434.

  • Can I find deals for flights from Philadelphia to London that include hotel bookings?

    Yes. In addition to deals on Philadelphia to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to London.

  • Can I find deals for business class flights from Philadelphia to London?

    Yes. Cheapflights offers flight deals from Philadelphia to London 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 Philadelphia to London?

    Currently, February is the cheapest month in which you can book a flight from Philadelphia to London (average of £184). Flying from Philadelphia to London in June is currently the most expensive (average of £408). 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

Travelling to a place near London?

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Alternative routes for Philadelphia to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Philadelphia to London

Discover the top 5 airlines that operate flights from Philadelphia to London. 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 November 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£394Average£570FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£402Average£709FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
JetBlueCheapest£438Average£533FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IberiaCheapest£474Average£551FlexibilityNo cancel feeOn-time77%
Search Iberia flights
American AirlinesCheapest£523Average£682FlexibilityNo cancel feeOn-time71%
Search American Airlines 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 Philadelphia to London?

Cheapflights makes it easy to find Philadelphia to London flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Philadelphia to London?

Cheapflights simply makes it quick and affordable to book flights from Philadelphia to London by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Philadelphia to London with no change fees?

Certainly. Search results for flights to London from Philadelphia shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Philadelphia to London become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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