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Cheap flights from London to Philadelphia from £225

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Philadelphia departing on 12/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London to Philadelphia

Cheap return flights

Logo
10:00 - 20:55LGW-PHL
15h 55m1 stop
Logo
16:03 - 06:55PHL-LGW
33h 52m1 stop
£350
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Fri, 5 Sep - Sun, 21 Sep
Logo
10:00 - 08:50LGW-PHL
27h 50m1 stop
Logo
16:03 - 06:55PHL-LGW
33h 52m1 stop
£354
Find Deal
Sat, 20 Sep - Sun, 21 Sep
United Airlines Logo
17:40 - 09:54LHR-PHL
21h 14m2 stops
United Airlines Logo
17:35 - 16:40PHL-LHR
18h 05m1 stop
£369United Airlines
Find Deal
Sat, 20 Sep - Sun, 21 Sep
Aer Lingus Logo
09:50 - 19:00LHR-PHL
14h 10m1 stop
Aer Lingus Logo
20:30 - 11:10PHL-LHR
9h 40m1 stop
£412Aer Lingus
Find Deal
Wed, 3 Sep - Mon, 8 Sep
United Airlines Logo
08:30 - 09:54LHR-PHL
30h 24m1 stop
United Airlines Logo
17:35 - 16:40PHL-LHR
18h 05m1 stop
£431United Airlines
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Sat, 20 Sep - Sun, 21 Sep
Aer Lingus Logo
13:25 - 19:00LHR-PHL
10h 35m1 stop
Aer Lingus Logo
20:30 - 11:10PHL-LHR
9h 40m1 stop
£434Aer Lingus
Find Deal
Wed, 27 Aug - Wed, 3 Sep
British Airways Logo
06:50 - 13:55LCY-PHL
12h 05m1 stop
British Airways Logo
21:10 - 12:40PHL-LCY
10h 30m1 stop
£510British Airways
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Tue, 16 Dec - Tue, 23 Dec
British Airways Logo
08:30 - 16:00LCY-PHL
12h 30m1 stop
British Airways Logo
18:50 - 10:20PHL-LCY
10h 30m1 stop
£526British Airways
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Wed, 3 Sep - Mon, 8 Sep
Iberia Logo
07:50 - 15:35LCY-PHL
12h 45m1 stop
Iberia Logo
20:00 - 14:05PHL-LCY
13h 05m1 stop
£555Iberia
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Wed, 17 Dec - Tue, 6 Jan
Iberia Logo
07:50 - 20:20LCY-PHL
17h 30m2 stops
Iberia Logo
20:00 - 14:05PHL-LCY
13h 05m1 stop
£563Iberia
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Wed, 17 Dec - Tue, 6 Jan

Icelandair flights from London to Philadelphia

Our best Icelandair deals on London to Philadelphia flight tickets
Icelandair
11 Sept
LGW12:10London Gatwick
26h 12m
1 stop
PHL09:22Philadelphia
18 Sept
PHL18:10Philadelphia
10h 25m
1 stop
LGW09:35London Gatwick
£421
Find similar
Icelandair
11 Sept
LGW12:10London Gatwick
26h 12m
1 stop
PHL09:22Philadelphia
18 Sept
PHL18:10Philadelphia
10h 25m
1 stop
LGW09:35London Gatwick
£423
Find similar
Icelandair
29 Aug
LHR08:25London Heathrow
30h 15m
1 stop
PHL09:40Philadelphia
11 Sept
PHL10:20Philadelphia
15h 10m
1 stop
LHR06:30London Heathrow
£437
Find similar

Lufthansa flights from London to Philadelphia

Our best Lufthansa deals on London to Philadelphia flight tickets
Lufthansa
5 Sept
LHR06:30London Heathrow
14h 30m
1 stop
PHL16:00Philadelphia
6 Sept
PHL15:25Philadelphia
48h 35m
2 stops
LHR21:00London Heathrow
£428
Find similar
Lufthansa
11 Sept
LHR11:30London Heathrow
33h 30m
1 stop
PHL16:00Philadelphia
13 Sept
PHL15:25Philadelphia
39h 25m
2 stops
LHR11:50London Heathrow
£434
Find similar
Lufthansa
11 Sept
LHR19:10London Heathrow
25h 50m
2 stops
PHL16:00Philadelphia
13 Sept
PHL15:25Philadelphia
39h 25m
2 stops
LHR11:50London Heathrow
£436
Find similar

momondo 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, momondo users made 279,928 searches. Data last updated 15 August 2025.
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

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Fri 5/9

10:00-20:55

1 stop15h 55m

Philadelphia

Sun 21/9

16:03-06:55

1 stop33h 52m

£350

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Sat 20/9

10:00-08:50

1 stop27h 50m

Philadelphia

Sun 21/9

16:03-06:55

1 stop33h 52m

£354

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 20/9

17:40-09:54

2 stops21h 14m

Philadelphia

Sun 21/9

17:35-16:40

1 stop18h 05m

£369

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 3/9

09:50-19:00

1 stop14h 10m

Philadelphia

Mon 8/9

20:30-11:10

1 stop9h 40m

£412

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 20/9

08:30-09:54

1 stop30h 24m

Philadelphia

Sun 21/9

17:35-16:40

1 stop18h 05m

£431

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 27/8

13:25-19:00

1 stop10h 35m

Philadelphia

Wed 3/9

20:30-11:10

1 stop9h 40m

£434

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Tue 16/12

06:50-13:55

1 stop12h 05m

Philadelphia

Tue 23/12

21:10-12:40

1 stop10h 30m

£510

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Wed 3/9

08:30-16:00

1 stop12h 30m

Philadelphia

Mon 8/9

18:50-10:20

1 stop10h 30m

£526

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Wed 17/12

07:50-15:35

1 stop12h 45m

Philadelphia

Tue 6/1

20:00-14:05

1 stop13h 05m

£555

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Wed 17/12

07:50-20:20

2 stops17h 30m

Philadelphia

Tue 6/1

20:00-14:05

1 stop13h 05m

£563

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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See travel insights to Philadelphia from

How to get the cheapest flight ticket from London to Philadelphia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between London and Philadelphia?

What is the cheapest month to fly to Philadelphia?

If you aren’t able to travel during the month of February, then book flights to Philadelphia from London during September instead. Flights to Philadelphia in September, while not as cheap as those in February, still average around £493.

What is the cheapest day to depart on your flight to Philadelphia?

Our data shows that Tuesday is the least expensive day to fly to Philadelphia. Tickets to fly out on this day can be as low as £593. On the other hand, Sunday is the most expensive day to depart from London because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £654.

What is the cheapest time of day to depart on your flight to Philadelphia?

The cheapest time of day to fly to Philadelphia is in the afternoon when flights can be purchased for as low as £496. At midday is when there is more demand to fly to Philadelphia, so prices are often more expensive at around £623 per ticket.

What is the cheapest London to Philadelphia flight route?

Fly from London Heathrow to Philadelphia for the best London - Philadelphia flight prices

How far in advance should I book a flight to Philadelphia?

You are more likely to see cheaper flights to Philadelphia from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around £555 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from London for as low as £507 on momondo.

What cabin class options are available on London to Philadelphia flights?

There are 3 cabin classes available to choose from on London to Philadelphia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have London to Philadelphia flight prices changed over time?

As of August 2025, prices for London to Philadelphia flights are approximately 12% cheaper when compared to flights at the same time last year.

When to book flights from London to Philadelphia

Are you open to changing your travel dates? Check out the ideal times to fly from London to Philadelphia according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London to Philadelphia (LON to PHL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Philadelphia

Best price found

£225

Fastest flight time

10h 30m

Direct flights

Every day

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from London in the past 72 hours is £225. The best return flight deal from London to Philadelphia found on momondo in the last 72 hours is £350.
The fastest flight from London to Philadelphia takes 10h 30m
Direct flights go from London to Philadelphia every day.
There is 1 airport near Philadelphia: Philadelphia (PHL)
Search flight deals

  • How far is London to Philadelphia by plane?

    London and Philadelphia are 3538.9 mi apart from one another. 10h 30m is a normal flight duration for this route.

  • When did momondo last update prices for flights from London to Philadelphia Airport?

    Prices for flights from London to Philadelphia Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from London to Philadelphia Airport?

  • How old do you have to be to fly from London to Philadelphia Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Philadelphia Airport.

  • What documentation or ID do you need to fly to Philadelphia Airport?

    The travel and health documents you'll need for your trip to Philadelphia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Philadelphia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London to Philadelphia?

  • What is the most popular airline from London to Philadelphia?

Best airlines flying from London to Philadelphia

Compare and see reviews for airlines that fly from London to Philadelphia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom £300Free CancellationRating
7.4
8,915 reviews
Search United Airlines flights
IcelandairPriceFrom £332Free CancellationRating
7.0
526 reviews
Search Icelandair flights
Air CanadaPriceFrom £334Free CancellationRating
7.1
9,956 reviews
Search Air Canada flights
JetBluePriceFrom £354Free CancellationRating
7.2
2,913 reviews
Search JetBlue flights
LufthansaPriceFrom £408Free CancellationRating
6.8
7,321 reviews
Search Lufthansa flights
British AirwaysPriceFrom £429Free CancellationRating
6.6
7,267 reviews
Search British Airways flights
FinnairPriceFrom £439Free CancellationRating
7.6
1,321 reviews
Search Finnair flights
American AirlinesPriceFrom £441Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Aer LingusPriceFrom £449Free CancellationRating
7.1
1,214 reviews
Search Aer Lingus flights
IberiaPriceFrom £465Free CancellationRating
7.0
2,882 reviews
Search Iberia flights

  • Finnair Flights From London to Philadelphia

    Finnair flies from London to Philadelphia around 20 times per week, with 1,321 momondo users rating the airline 7.6/10. The cheapest Finnair deal from London to Philadelphia in the last 72 hours was £595 (round-trip), much lower than the average airfare cost of £752 for Finnair flights on this route.

  • American Airlines Flights From London to Philadelphia

    Another popular option for London to Philadelphia flights is American Airlines (7.2/10, 10,000 ratings). American Airlines flies from London to Philadelphia around 20 times per week, with deals starting from £599 round-trip and rising to an average price of around £789.

Travelling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Dover
Newark
Reading
Vineland
King of Prussia
Cape May
Essington
Rehoboth Beach
Cherry Hill
Dewey Beach

Why use momondo?

Why should I use momondo to find a flight deal from London to Philadelphia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Philadelphia . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Philadelphia with flexible booking policies on momondo?

Flights from London to Philadelphia with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Philadelphia?

momondo provides multiple filters to help you find the best flight to Philadelphia from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Philadelphia right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Philadelphia, momondo offers a useful price alert feature which will track prices for flights to Philadelphia from London and alert you when they change.

An easier way to manage your Philadelphia trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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