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Cheap flights from Philadelphia to London from £118

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 23/10. 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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Cheap return flights

Multiple Airlines Logo
16:50 - 06:35PHL-LHR
32h 45m1 stop
Multiple Airlines Logo
06:50 - 14:38LHR-PHL
12h 48m2 stops
£360Multiple Airlines
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Sat, 4 Oct - Thu, 16 Oct
Aer Lingus Logo
17:30 - 10:10PHL-LHR
11h 40m1 stop
Aer Lingus Logo
08:50 - 16:00LHR-PHL
12h 10m1 stop
£361Aer Lingus
Find Deal
Tue, 11 Nov - Fri, 21 Nov
Air Canada Logo
15:30 - 07:10PHL-LHR
10h 40m1 stop
Air Canada Logo
06:50 - 14:47LHR-PHL
12h 57m2 stops
£361Air Canada
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Fri, 7 Nov - Sun, 9 Nov
American Airlines Logo
19:50 - 08:05PHL-LHR
7h 15mdirect
American Airlines Logo
08:55 - 16:50LHR-PHL
12h 55m1 stop
£362American Airlines
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Mon, 29 Sep - Thu, 9 Oct
Multiple Airlines Logo
15:25 - 09:35PHL-LHR
13h 10m1 stop
Multiple Airlines Logo
06:50 - 15:49LHR-PHL
13h 59m2 stops
£363Multiple Airlines
Find Deal
Wed, 1 Oct - Tue, 7 Oct
American Airlines Logo
18:30 - 06:40PHL-LHR
7h 10mdirect
American Airlines Logo
08:25 - 15:40LHR-PHL
12h 15m1 stop
£364American Airlines
Find Deal
Wed, 22 Oct - Tue, 4 Nov
Lufthansa Logo
15:30 - 07:10PHL-LHR
10h 40m1 stop
Lufthansa Logo
08:30 - 16:05LHR-PHL
12h 35m1 stop
£368Lufthansa
Find Deal
Wed, 5 Nov - Tue, 11 Nov
Air Canada Logo
15:30 - 07:10PHL-LHR
10h 40m1 stop
Air Canada Logo
13:25 - 14:31LHR-PHL
30h 06m2 stops
£370Air Canada
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Tue, 6 Jan - Tue, 13 Jan
British Airways Logo
18:30 - 06:40PHL-LHR
7h 10mdirect
British Airways Logo
10:15 - 13:25LHR-PHL
8h 10mdirect
£375British Airways
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Wed, 15 Oct - Wed, 5 Nov
British Airways Logo
18:30 - 06:40PHL-LHR
7h 10mdirect
British Airways Logo
13:30 - 16:25LHR-PHL
7h 55mdirect
£380British Airways
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Wed, 15 Oct - Thu, 23 Oct

Air Canada flights from Philadelphia to London Heathrow Airport

Our best Air Canada deals on Philadelphia to London Heathrow Airport flight tickets
Air Canada
7 Nov
PHL15:30Philadelphia
10h 40m
1 stop
LHR07:10London Heathrow
9 Nov
LHR06:50London Heathrow
12h 57m
2 stops
PHL14:47Philadelphia
£361
Find similar
Air Canada
22 Sept
PHL16:50Philadelphia
14h 00m
1 stop
LHR11:50London Heathrow
1 Oct
LHR09:30London Heathrow
17h 08m
1 stop
PHL21:38Philadelphia
£366
Find similar
Air Canada
6 Jan
PHL15:30Philadelphia
10h 40m
1 stop
LHR07:10London Heathrow
13 Jan
LHR13:25London Heathrow
30h 06m
2 stops
PHL14:31Philadelphia
£370
Find similar

Delta flights from Philadelphia to London Heathrow Airport

Our best Delta deals on Philadelphia to London Heathrow Airport flight tickets
Delta
8 Oct
PHL06:50Philadelphia
18h 55m
1 stop
LHR06:45London Heathrow
15 Oct
LHR06:15London Heathrow
17h 59m
2 stops
PHL19:14Philadelphia
£384
Find similar
Delta
8 Oct
PHL17:40Philadelphia
11h 50m
1 stop
LHR10:30London Heathrow
24 Oct
LHR08:40London Heathrow
17h 52m
2 stops
PHL21:32Philadelphia
£385
Find similar
Delta
29 Sept
PHL13:35Philadelphia
12h 10m
1 stop
LHR06:45London Heathrow
6 Oct
LHR09:55London Heathrow
35h 40m
2 stops
PHL16:35Philadelphia
£386
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 17 September 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

Sat 4/10

16:50-06:35

1 stop32h 45m

London Heathrow

Thu 16/10

06:50-14:38

2 stops12h 48m

£360

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 11/11

17:30-10:10

1 stop11h 40m

London Heathrow

Fri 21/11

08:50-16:00

1 stop12h 10m

£361

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 7/11

15:30-07:10

1 stop10h 40m

London Heathrow

Sun 9/11

06:50-14:47

2 stops12h 57m

£361

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 29/9

19:50-08:05

Nonstop7h 15m

London Heathrow

Thu 9/10

08:55-16:50

1 stop12h 55m

£362

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 1/10

15:25-09:35

1 stop13h 10m

London Heathrow

Tue 7/10

06:50-15:49

2 stops13h 59m

£363

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 22/10

18:30-06:40

Nonstop7h 10m

London Heathrow

Tue 4/11

08:25-15:40

1 stop12h 15m

£364

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 5/11

15:30-07:10

1 stop10h 40m

London Heathrow

Tue 11/11

08:30-16:05

1 stop12h 35m

£368

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 6/1

15:30-07:10

1 stop10h 40m

London Heathrow

Tue 13/1

13:25-14:31

2 stops30h 06m

£370

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 15/10

18:30-06:40

Nonstop7h 10m

London Heathrow

Wed 5/11

10:15-13:25

Nonstop8h 10m

£375

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 15/10

18:30-06:40

Nonstop7h 10m

London Heathrow

Thu 23/10

13:30-16:25

Nonstop7h 55m

£380

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Philadelphia and London Heathrow Airport?

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 £483. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Philadelphia averaging around £511.

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 £501. 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 £731.

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 £532. 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 afternoon when prices are £622 on average. Flights to London Heathrow Airport from Philadelphia in the afternoon 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 £602 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 £528 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 25% 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 September 2025, prices for Philadelphia to London Heathrow Airport flights are approximately 25% 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

£379

Fastest flight time

7h 00m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Philadelphia in the past 72 hours is £379. The best return flight deal from Philadelphia to London Heathrow Airport found on momondo in the last 72 hours is £462.
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 10m.

  • 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 £384Free CancellationRating
6.7
7,363 reviews
Search British Airways flights
Aer LingusPriceFrom £385Free CancellationRating
7.2
1,274 reviews
Search Aer Lingus flights
JetBluePriceFrom £420Free CancellationRating
7.2
2,914 reviews
Search JetBlue flights
IberiaPriceFrom £454Free CancellationRating
7.0
2,924 reviews
Search Iberia flights
American AirlinesPriceFrom £501Free CancellationRating
7.2
10,000 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 1,274 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 £525 (round-trip), much lower than the average airfare cost of £1,041 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 £683, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at £891 round-trip. American Airlines operates 21 flights out of Philadelphia into London Heathrow Airport in an average week, so prices vary by time and availability. 10,000 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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