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Cheap flights from Philadelphia to London from £193

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 10/12. 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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British Airways Logo
16:05 - 07:00PHL-LHR
9h 55m1 stop
British Airways Logo
10:15 - 13:15LHR-PHL
8h 00mdirect
£431British Airways
Find Deal
Tue, 9 Dec - Sun, 14 Dec
British Airways Logo
18:35 - 06:35PHL-LHR
7h 00mdirect
British Airways Logo
13:10 - 16:15LHR-PHL
8h 05mdirect
£432British Airways
Find Deal
Thu, 15 Jan - Tue, 20 Jan
British Airways Logo
19:50 - 07:50PHL-LHR
7h 00mdirect
British Airways Logo
10:35 - 13:50LHR-PHL
8h 15mdirect
£433British Airways
Find Deal
Sun, 25 Jan - Sun, 1 Feb
British Airways Logo
15:35 - 09:15PHL-LHR
12h 40m1 stop
British Airways Logo
13:10 - 16:15LHR-PHL
8h 05mdirect
£435British Airways
Find Deal
Tue, 27 Jan - Mon, 9 Feb
British Airways Logo
18:00 - 07:00PHL-LHR
9h 00m1 stop
British Airways Logo
13:10 - 17:15LHR-PHL
8h 05mdirect
£435British Airways
Find Deal
Mon, 9 Mar - Sun, 15 Mar
British Airways Logo
17:20 - 12:05PHL-LHR
13h 45m1 stop
British Airways Logo
13:10 - 16:15LHR-PHL
8h 05mdirect
£436British Airways
Find Deal
Thu, 27 Nov - Thu, 4 Dec
British Airways Logo
16:45 - 09:15PHL-LHR
11h 30m1 stop
British Airways Logo
13:10 - 16:15LHR-PHL
8h 05mdirect
£437British Airways
Find Deal
Sun, 25 Jan - Sun, 1 Feb
British Airways Logo
18:35 - 06:35PHL-LHR
7h 00mdirect
British Airways Logo
10:15 - 13:15LHR-PHL
8h 00mdirect
£438British Airways
Find Deal
Tue, 2 Dec - Fri, 26 Dec
British Airways Logo
16:17 - 07:00PHL-LHR
9h 43m1 stop
British Airways Logo
11:45 - 19:34LHR-PHL
12h 49m1 stop
£438British Airways
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Thu, 11 Dec - Wed, 24 Dec
British Airways Logo
19:45 - 07:50PHL-LHR
7h 05mdirect
British Airways Logo
12:35 - 19:53LHR-PHL
12h 18m1 stop
£439British Airways
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Fri, 13 Feb - Wed, 18 Feb

British Airways flights from Philadelphia to London Heathrow Airport

Our best British Airways deals on Philadelphia to London Heathrow Airport flight tickets
British Airways
9 Dec
PHL16:05Philadelphia
9h 55m
1 stop
LHR07:00London Heathrow
14 Dec
LHR10:15London Heathrow
8h 00m
PHL13:15Philadelphia
£431
Find similar
British Airways
11 Feb
PHL15:35Philadelphia
12h 40m
1 stop
LHR09:15London Heathrow
15 Feb
LHR13:10London Heathrow
8h 05m
PHL16:15Philadelphia
£432
Find similar
British Airways
25 Jan
PHL19:50Philadelphia
7h 00m
LHR07:50London Heathrow
1 Feb
LHR10:35London Heathrow
8h 15m
PHL13:50Philadelphia
£433
Find similar

Air Canada flights from Philadelphia to London Heathrow Airport

Our best Air Canada deals on Philadelphia to London Heathrow Airport flight tickets
Air Canada
16 Nov
PHL15:30Philadelphia
10h 40m
1 stop
LHR07:10London Heathrow
25 Nov
LHR09:00London Heathrow
34h 47m
2 stops
PHL14:47Philadelphia
£442
Find similar
Air Canada
3 Dec
PHL15:30Philadelphia
10h 40m
1 stop
LHR07:10London Heathrow
10 Dec
LHR06:50London Heathrow
13h 00m
2 stops
PHL14:50Philadelphia
£458
Find similar
Air Canada
18 Nov
PHL15:30Philadelphia
24h 05m
2 stops
LHR20:35London Heathrow
25 Nov
LHR09:00London Heathrow
34h 47m
2 stops
PHL14:47Philadelphia
£459
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Philadelphia to London Heathrow Airport 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 14 November 2025.
Use the filters below to find and compare flights from Philadelphia to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 9/12

16:05-07:00

1 stop9h 55m

London Heathrow

Sun 14/12

10:15-13:15

Nonstop8h 00m

£431

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Thu 15/1

18:35-06:35

Nonstop7h 00m

London Heathrow

Tue 20/1

13:10-16:15

Nonstop8h 05m

£432

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 25/1

19:50-07:50

Nonstop7h 00m

London Heathrow

Sun 1/2

10:35-13:50

Nonstop8h 15m

£433

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 27/1

15:35-09:15

1 stop12h 40m

London Heathrow

Mon 9/2

13:10-16:15

Nonstop8h 05m

£435

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 9/3

18:00-07:00

1 stop9h 00m

London Heathrow

Sun 15/3

13:10-17:15

Nonstop8h 05m

£435

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Thu 27/11

17:20-12:05

1 stop13h 45m

London Heathrow

Thu 4/12

13:10-16:15

Nonstop8h 05m

£436

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 25/1

16:45-09:15

1 stop11h 30m

London Heathrow

Sun 1/2

13:10-16:15

Nonstop8h 05m

£437

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 2/12

18:35-06:35

Nonstop7h 00m

London Heathrow

Fri 26/12

10:15-13:15

Nonstop8h 00m

£438

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Thu 11/12

16:17-07:00

1 stop9h 43m

London Heathrow

Wed 24/12

11:45-19:34

1 stop12h 49m

£438

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 13/2

19:45-07:50

Nonstop7h 05m

London Heathrow

Wed 18/2

12:35-19:53

1 stop12h 18m

£439

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 Heathrow Airport

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 Heathrow Airport?

In general, September is the cheapest month to fly from Philadelphia to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £499. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Philadelphia averaging around £505.

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

On average, the least expensive day to fly to London Heathrow Airport from Philadelphia is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £520. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £752.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is at midday. momondo users have found flights departing from Philadelphia to London Heathrow Airport at midday for as low as £551. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are £623 on average. Flights to London Heathrow Airport from Philadelphia in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Philadelphia to London Heathrow flight route?

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

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

You are more likely to see cheaper flights to London Heathrow Airport from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £618 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Philadelphia for as low as £529 on momondo.

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

There are 3 cabin classes available to choose from on Philadelphia to London Heathrow 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 Heathrow Airport flights?

You could potentially save up to 59% on your flight if you consider stops on a Philadelphia to London Heathrow Airport flight.

How have Philadelphia to London Heathrow Airport flight prices changed over time?

As of November 2025, prices for Philadelphia to London Heathrow Airport flights are approximately 9% cheaper when compared to flights at the same time last year.

When to book flights from Philadelphia to London Heathrow Airport

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

Cheap Philadelphia to London Heathrow Airport (PHL to LHR) flight deals and tips

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

Best price found

£642

Fastest flight time

7h 00m

Direct flights

Every day
The best flight deal from Philadelphia to London Heathrow Airport found on momondo in the last 72 hours is £642
The fastest flight from Philadelphia to London Heathrow Airport takes 7h 00m
Direct flights go from Philadelphia to London Heathrow Airport every day.
Search flight deals

  • How far is Philadelphia to London Heathrow by plane?

    The distance between Philadelphia and London Heathrow is about 3526.0 mi. In terms of flight time, this usually takes a little over 7h 00m.

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

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

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

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

    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 Heathrow Airport.

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

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

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

Best airlines flying from Philadelphia to London Heathrow Airport

Compare and see reviews for airlines that fly from Philadelphia to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom £392Free CancellationRating
6.7
7,521 reviews
Search British Airways flights
Aer LingusPriceFrom £399Free CancellationRating
7.2
1,370 reviews
Search Aer Lingus flights
JetBluePriceFrom £435Free CancellationRating
7.2
2,907 reviews
Search JetBlue flights
IberiaPriceFrom £471Free CancellationRating
7.0
3,012 reviews
Search Iberia flights
American AirlinesPriceFrom £519Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights

  • Aer Lingus Flights From Philadelphia to London Heathrow Airport

    Aer Lingus flies from Philadelphia to London Heathrow Airport around 7 times per week, with 1,370 momondo users rating the airline 7.2/10. The cheapest Aer Lingus deal from Philadelphia to London Heathrow Airport in the last 72 hours was £399 (round-trip), much lower than the average airfare cost of £705 for Aer Lingus flights on this route.

  • American Airlines Flights From Philadelphia to London Heathrow Airport

    The best American Airlines deal for Philadelphia to London Heathrow Airport flight tickets found on momondo in the last 72 hours was £519, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at £677 round-trip. American Airlines operates 14 flights out of Philadelphia into London Heathrow Airport in an average week, so prices vary by time and availability. 11,051 American Airlines reviews by users on momondo have scored the airline at 7.2/10.

Travelling to a place near London?

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Why use momondo?

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

It is quick and easy to find Philadelphia to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

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

Flights from Philadelphia to London 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 Philadelphia to London?

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

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

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

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