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Cheap flights from Philadelphia to London from $179

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 3/24. 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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Find the cheapest flights from Philadelphia to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:50 am - 10:10 am
PHL
-
LHR
21h 20m
2 stops
Multiple Airlines Logo
8:45 pm - 10:46 pm
LHR
-
PHL
31h 01m
2 stops
$597Multiple Airlines
Tue, Feb 10 - Tue, Feb 17
Multiple Airlines Logo
12:24 pm - 10:00 am
PHL
-
LGW
16h 36m
2 stops
Multiple Airlines Logo
2:00 pm - 11:16 pm
LGW
-
PHL
14h 16m
1 stop
$597Multiple Airlines
Thu, Feb 5 - Mon, Feb 23
British Airways Logo
4:50 pm - 10:25 am
PHL
-
LHR
12h 35m
1 stop
British Airways Logo
7:50 am - 2:05 pm
LHR
-
PHL
11h 15m
1 stop
$598British Airways
Tue, Jan 20 - Sun, Jan 25
Air Canada Logo
3:30 pm - 11:20 am
PHL
-
LHR
14h 50m
2 stops
Air Canada Logo
6:50 am - 2:47 pm
LHR
-
PHL
12h 57m
2 stops
$599Air Canada
Mon, Jan 26 - Fri, Feb 27
British Airways Logo
7:50 pm - 7:50 am
PHL
-
LHR
7h 00mnonstop
British Airways Logo
7:50 am - 2:05 pm
LHR
-
PHL
11h 15m
1 stop
$600British Airways
Tue, Jan 20 - Sun, Jan 25
British Airways Logo
4:45 pm - 7:00 am
PHL
-
LHR
9h 15m
1 stop
British Airways Logo
8:50 am - 4:00 pm
LHR
-
PHL
12h 10m
1 stop
$601British Airways
Thu, Feb 26 - Thu, Mar 5
Delta Logo
2:30 pm - 7:50 am
PHL
-
LHR
12h 20m
1 stop
Delta Logo
9:00 am - 9:13 pm
LHR
-
PHL
17h 13m
2 stops
$602Delta
Sun, Feb 1 - Wed, Feb 25
Delta Logo
12:59 pm - 7:50 am
PHL
-
LHR
14h 51m
1 stop
Delta Logo
6:30 am - 9:23 pm
LHR
-
PHL
19h 53m
2 stops
$603Delta
Wed, Mar 25 - Tue, Mar 31
Air Canada Logo
3:30 pm - 6:30 am
PHL
-
LHR
10h 00m
1 stop
Air Canada Logo
8:40 am - 10:43 pm
LHR
-
PHL
19h 03m
2 stops
$604Air Canada
Wed, Apr 1 - Wed, Apr 8
Virgin Atlantic Logo
12:29 pm - 9:20 am
PHL
-
LHR
15h 51m
2 stops
Virgin Atlantic Logo
8:55 am - 9:16 pm
LHR
-
PHL
17h 21m
2 stops
$607Virgin Atlantic
Wed, Jan 21 - Wed, Jan 28

Finnair flights from Philadelphia to London

Our best Finnair deals on Philadelphia to London flight tickets
Finnair
Apr 1
PHL6:45 pmPhiladelphia
7h 05m
LHR6:50 amLondon Heathrow
Apr 7
LHR9:15 amLondon Heathrow
8h 00m
PHL12:15 pmPhiladelphia
$604
Finnair
Jan 21
PHL7:50 pmPhiladelphia
7h 00m
LHR7:50 amLondon Heathrow
Jan 25
LHR10:15 amLondon Heathrow
8h 15m
PHL1:30 pmPhiladelphia
$629
Finnair
Jan 22
PHL7:50 pmPhiladelphia
7h 00m
LHR7:50 amLondon Heathrow
Jan 29
LHR10:35 amLondon Heathrow
8h 15m
PHL1:50 pmPhiladelphia
$631

Air Canada flights from Philadelphia to London

Our best Air Canada deals on Philadelphia to London flight tickets
Air Canada
Feb 18
PHL7:35 amPhiladelphia
20h 45m
2 stops
LHR9:20 amLondon Heathrow
Mar 3
LHR6:50 amLondon Heathrow
12h 57m
2 stops
PHL2:47 pmPhiladelphia
$596
Air Canada
Feb 25
PHL3:30 pmPhiladelphia
14h 50m
2 stops
LHR11:20 amLondon Heathrow
Mar 4
LHR6:50 amLondon Heathrow
12h 57m
2 stops
PHL2:47 pmPhiladelphia
$599
Air Canada
Apr 25
PHL3:30 pmPhiladelphia
24h 30m
2 stops
LHR9:00 pmLondon Heathrow
May 13
LHR8:40 amLondon Heathrow
17h 53m
2 stops
PHL9:33 pmPhiladelphia
$600

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated January 14, 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 - LHR

PHLLHR

Philadelphia

Tue 2/10

7:50 am-10:10 am

2 stops21h 20m

London Heathrow

Tue 2/17

8:45 pm-10:46 pm

2 stops31h 01m

$597

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

Thu 2/5

12:24 pm-10:00 am

2 stops16h 36m

London Gatwick

Mon 2/23

2:00 pm-11:16 pm

1 stop14h 16m

$597

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 1/20

4:50 pm-10:25 am

1 stop12h 35m

London Heathrow

Sun 1/25

7:50 am-2:05 pm

1 stop11h 15m

$598

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 1/26

3:30 pm-11:20 am

2 stops14h 50m

London Heathrow

Fri 2/27

6:50 am-2:47 pm

2 stops12h 57m

$599

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 1/20

7:50 pm-7:50 am

Nonstop7h 00m

London Heathrow

Sun 1/25

7:50 am-2:05 pm

1 stop11h 15m

$600

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Thu 2/26

4:45 pm-7:00 am

1 stop9h 15m

London Heathrow

Thu 3/5

8:50 am-4:00 pm

1 stop12h 10m

$601

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 2/1

2:30 pm-7:50 am

1 stop12h 20m

London Heathrow

Wed 2/25

9:00 am-9:13 pm

2 stops17h 13m

$602

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 3/25

12:59 pm-7:50 am

1 stop14h 51m

London Heathrow

Tue 3/31

6:30 am-9:23 pm

2 stops19h 53m

$603

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 4/1

3:30 pm-6:30 am

1 stop10h 00m

London Heathrow

Wed 4/8

8:40 am-10:43 pm

2 stops19h 03m

$604

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 1/21

12:29 pm-9:20 am

2 stops15h 51m

London Heathrow

Wed 1/28

8:55 am-9:16 pm

2 stops17h 21m

$607

Flights are sorted by cheapest round-trip 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 typical price of a round-trip flight between Philadelphia and London?

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 $648, 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 $663.

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

The cheapest day to depart from Philadelphia to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $769. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $984. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Philadelphia in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $853 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $878. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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 $826 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Philadelphia for as low as $684 on momondo.

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

There are 4 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 7% 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 January 2026, prices for Philadelphia to London flights are approximately 95% 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 round-trip 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

$328

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 $328. The best round-trip flight deal from Philadelphia to London found on momondo in the last 72 hours is $724.
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?

    A flight from Philadelphia to London will travel around 3538.9 mi. Typically, this will take 7h 00m by plane in normal conditions.

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

    Prices for flights from Philadelphia Airport to London refresh 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 required travel and health documents for your London trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London. We recommend that you seek guidance from your airline or a reliable 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 $508Free CancellationRating
6.7
7,671 reviews
Search British Airways flights
American AirlinesPriceFrom $509Free CancellationRating
7.2
11,120 reviews
Search American Airlines flights
FinnairPriceFrom $515Free CancellationRating
7.6
1,348 reviews
Search Finnair flights
Aer LingusPriceFrom $522Free CancellationRating
7.2
1,435 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $556Free CancellationRating
7.1
10,619 reviews
Search Air Canada flights
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,156 reviews
Search United Airlines flights
JetBluePriceFrom $580Free CancellationRating
7.2
2,884 reviews
Search JetBlue flights
IberiaPriceFrom $593Free CancellationRating
7.0
3,086 reviews
Search Iberia flights

  • Finnair Flights From Philadelphia to London

    Finnair operates around 14 flights from Philadelphia to London every week. The average price of these flights found in the last 72 hours has been $778, but momondo users have found Finnair deals from Philadelphia to London from as low as $515 round-trip. Finnair has been scored 7.6/10 in 1,349 reviews.

  • American Airlines Flights From Philadelphia to London

    $509 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 $838, however, with flight time and availability significantly affecting the price. American Airlines (7.2/10 from 11,124 user reviews) flies into London from Philadelphia 14 times in an average week so prices can vary.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Luton
Milton Keynes
Dover
Slough
Guildford
Crawley
Dartford
Hayes
Wembley
Brentwood
Watford
Cobham
Folkestone
Romford
Harrow
Croydon
Richmond
Uxbridge

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Philadelphia.

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

Yes. momondo allows you to filter the results for Philadelphia to London flights to just show those with flexible booking policies.

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

Once you have performed a search for Philadelphia to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to London from Philadelphia are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your London trip

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