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Cheap flights from Philadelphia to London from £138

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to London departing on 24/3. 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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0 bags

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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
16:25 - 11:35
PHL
-
STN
14h 10m
2 stops
Multiple Airlines Logo
22:00 - 15:44
STN
-
PHL
22h 44m
2 stops
£442Multiple Airlines
Wed, 1 Apr - Tue, 7 Apr
Multiple Airlines Logo
15:45 - 06:00
PHL
-
LGW
57h 15m
2 stops
Multiple Airlines Logo
14:00 - 23:16
LGW
-
PHL
14h 16m
1 stop
£443Multiple Airlines
Fri, 20 Feb - Fri, 27 Feb
Multiple Airlines Logo
16:25 - 11:35
PHL
-
STN
14h 10m
2 stops
Multiple Airlines Logo
22:45 - 15:44
STN
-
PHL
21h 59m
2 stops
£444Multiple Airlines
Wed, 1 Apr - Mon, 6 Apr
Multiple Airlines Logo
20:25 - 11:25
PHL
-
LTN
10h 00m
1 stop
Multiple Airlines Logo
09:05 - 18:55
LTN
-
PHL
14h 50m
1 stop
£444Multiple Airlines
Sun, 19 Apr - Sun, 26 Apr
JetBlue Logo
15:02 - 06:55
PHL
-
LHR
11h 53m
1 stop
JetBlue Logo
09:20 - 19:24
LHR
-
PHL
14h 04m
1 stop
£471JetBlue
Tue, 10 Mar - Tue, 17 Mar
JetBlue Logo
06:00 - 06:55
PHL
-
LHR
19h 55m
1 stop
JetBlue Logo
09:20 - 22:36
LHR
-
PHL
17h 16m
1 stop
£476JetBlue
Sun, 1 Mar - Tue, 10 Mar
Aer Lingus Logo
20:25 - 11:10
PHL
-
LHR
9h 45m
1 stop
Aer Lingus Logo
12:00 - 18:55
LHR
-
PHL
11h 55m
1 stop
£477Aer Lingus
Sun, 12 Apr - Thu, 30 Apr
Iberia Logo
19:45 - 14:05
PHL
-
LCY
13h 20m
1 stop
Iberia Logo
07:50 - 16:55
LCY
-
PHL
13h 05m
1 stop
£558Iberia
Wed, 4 Mar - Thu, 19 Mar
Iberia Logo
19:45 - 14:05
PHL
-
LCY
13h 20m
1 stop
Iberia Logo
07:50 - 16:55
LCY
-
PHL
13h 05m
1 stop
£559Iberia
Wed, 4 Mar - Wed, 18 Mar
British Airways Logo
20:50 - 18:35
PHL
-
LCY
16h 45m
1 stop
British Airways Logo
19:25 - 14:55
LCY
-
PHL
23h 30m
1 stop
£562British Airways
Wed, 4 Mar - Tue, 10 Mar

Scandinavian Airlines flights from Philadelphia to London

Our best Scandinavian Airlines deals on Philadelphia to London flight tickets
Scandinavian Airlines
10 Mar
PHL11:16Philadelphia
24h 44m
2 stops
LHR16:00London Heathrow
17 Mar
LHR06:40London Heathrow
18h 43m
2 stops
PHL21:23Philadelphia
£505
Scandinavian Airlines
3 Mar
PHL11:09Philadelphia
17h 11m
2 stops
LHR09:20London Heathrow
17 Mar
LHR06:40London Heathrow
18h 43m
2 stops
PHL21:23Philadelphia
£513
Scandinavian Airlines
7 Apr
PHL11:08Philadelphia
17h 12m
2 stops
LHR09:20London Heathrow
28 Apr
LHR06:40London Heathrow
20h 32m
2 stops
PHL22:12Philadelphia
£518

American Airlines flights from Philadelphia to London

Our best American Airlines deals on Philadelphia to London flight tickets
American Airlines
10 Mar
PHL19:35Philadelphia
7h 00m
LHR06:35London Heathrow
17 Mar
LHR08:25London Heathrow
12h 30m
1 stop
PHL16:55Philadelphia
£521
American Airlines
14 Apr
PHL22:05Philadelphia
7h 15m
LHR10:20London Heathrow
29 Apr
LHR08:15London Heathrow
11h 45m
1 stop
PHL15:00Philadelphia
£525
American Airlines
7 Apr
PHL19:25Philadelphia
7h 25m
LHR07:50London Heathrow
22 Apr
LHR08:15London Heathrow
11h 45m
1 stop
PHL15:00Philadelphia
£526

momondo 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, momondo users made 279,928 searches. Data last updated 8 February 2026.
Use the filters below to find and compare flights from Philadelphia to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaLondon

PHL - STN

PHLSTN

Philadelphia

Wed 1/4

16:25-11:35

2 stops14h 10m

London Stansted

Tue 7/4

22:00-15:44

2 stops22h 44m

£442

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

Fri 20/2

15:45-06:00

2 stops57h 15m

London Gatwick

Fri 27/2

14:00-23:16

1 stop14h 16m

£443

PhiladelphiaLondon

PHL - STN

PHLSTN

Philadelphia

Wed 1/4

16:25-11:35

2 stops14h 10m

London Stansted

Mon 6/4

22:45-15:44

2 stops21h 59m

£444

PhiladelphiaLondon

PHL - LTN

PHLLTN

Philadelphia

Sun 19/4

20:25-11:25

1 stop10h 00m

London Luton

Sun 26/4

09:05-18:55

1 stop14h 50m

£444

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 10/3

15:02-06:55

1 stop11h 53m

London Heathrow

Tue 17/3

09:20-19:24

1 stop14h 04m

£471

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 1/3

06:00-06:55

1 stop19h 55m

London Heathrow

Tue 10/3

09:20-22:36

1 stop17h 16m

£476

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 12/4

20:25-11:10

1 stop9h 45m

London Heathrow

Thu 30/4

12:00-18:55

1 stop11h 55m

£477

PhiladelphiaLondon

PHL - LCY

PHLLCY

Philadelphia

Wed 4/3

19:45-14:05

1 stop13h 20m

London City

Thu 19/3

07:50-16:55

1 stop13h 05m

£558

PhiladelphiaLondon

PHL - LCY

PHLLCY

Philadelphia

Wed 4/3

19:45-14:05

1 stop13h 20m

London City

Wed 18/3

07:50-16:55

1 stop13h 05m

£559

PhiladelphiaLondon

PHL - LCY

PHLLCY

Philadelphia

Wed 4/3

20:50-18:35

1 stop16h 45m

London City

Tue 10/3

19:25-14:55

1 stop23h 30m

£562

Flights are sorted by cheapest return flights first.

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

How to get the cheapest flight ticket from Philadelphia to London

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 cheapest month to fly to London?

The cheapest month to fly to London from Philadelphia is in September. Flight prices, which tend to average around £481, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from Philadelphia averaging around £487.

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

Our data shows that Tuesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £490. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Philadelphia to London for around £729.

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

The cheapest time of day to fly to London is in the evening when flights can be purchased for as low as £579. Flights in the afternoon are often more expensive, with an average ticket price of £590.

What is the cheapest Philadelphia to London flight route?

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

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

You are more likely to see cheaper flights to London from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £608 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Philadelphia for as low as £506 on momondo.

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

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

Can stopping save me money on Philadelphia to London flights?

You could potentially save up to 4% on your flight if you consider stops on a Philadelphia to London flight.

How have Philadelphia to London flight prices changed over time?

As of February 2026, prices for Philadelphia to London flights are approximately 96% more expensive when compared to flights at the same time last year.

When to book flights from Philadelphia to London

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

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

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

Best price found

£277

Fastest flight time

7h 00m

Direct flights

Every day

Airports in London

6 airports
The best one-way flight to London from Philadelphia in the past 72 hours is £277. The best return flight deal from Philadelphia to London found on momondo in the last 72 hours is £573.
The fastest flight from Philadelphia to London takes 7h 00m
Direct flights go from Philadelphia to London every day.
There are 6 airports in London. From Philadelphia there are direct flights to London Heathrow (LHR).
Search flight deals

  • How far is Philadelphia to London by plane?

    The distance between Philadelphia and London is about 3538.9 mi. A reasonable flight in good conditions will take 7h 00m.

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

    Prices for flights from Philadelphia Airport to London are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to London.

  • What documentation or ID do you need to fly to London?

    The travel and health documents you'll need for your trip to London 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 London. 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 Philadelphia to London?

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

Best airlines flying from Philadelphia to London

Compare and see reviews for airlines that fly from Philadelphia to London with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom £379Free CancellationRating
6.7
7,719 reviews
Search British Airways flights
Aer LingusPriceFrom £386Free CancellationRating
7.2
1,446 reviews
Search Aer Lingus flights
JetBluePriceFrom £420Free CancellationRating
7.2
2,898 reviews
Search JetBlue flights
American AirlinesPriceFrom £502Free CancellationRating
7.2
11,247 reviews
Search American Airlines flights

  • Aer Lingus Flights From Philadelphia to London

    The lowest priced Aer Lingus flight from Philadelphia to London from the last 72 hours was £386. Generally, Aer Lingus has 7 flights on this route every week with an average price of £511. Aer Lingus is rated 7.2/10 by our users.

  • American Airlines Flights From Philadelphia to London

    £502 is the best American Airlines flight deal from Philadelphia to London found on momondo over the last 72 hours. The average American Airlines ticket price found was closer to £639, however, with flight time and availability significantly affecting the price. American Airlines (7.2/10 from 11,248 user reviews) flies into London from Philadelphia 13 times in an average week so prices can vary.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Slough
Maidstone
Southend-on-Sea
Canterbury
Ipswich
Ilford
Guildford
Chelmsford
Hayes
Wembley
Dover
Folkestone
Colchester
Bedford
Worthing
Ramsgate

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Philadelphia to London. momondo saves you time and could save you money on your trip.

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

Yes. All flights to London from Philadelphia on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Philadelphia to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes. momondo can track prices for Philadelphia to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport