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Cheap flights from Philadelphia to London from £173

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 6/12. 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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0 bags

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Cheap return flights

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Virgin Atlantic Logo
14:30 - 07:50PHL-LHR
12h 20m1 stop
Virgin Atlantic Logo
06:30 - 16:43LHR-PHL
15h 13m2 stops
£417Virgin Atlantic
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Sun, 9 Nov - Tue, 18 Nov
Air Canada Logo
15:30 - 20:35PHL-LHR
24h 05m2 stops
Air Canada Logo
09:00 - 22:46LHR-PHL
18h 46m2 stops
£420Air Canada
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Sun, 9 Nov - Tue, 18 Nov
Air Canada Logo
09:20 - 07:10PHL-LHR
40h 50m2 stops
Air Canada Logo
12:05 - 22:46LHR-PHL
39h 41m2 stops
£424Air Canada
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Sun, 9 Nov - Tue, 18 Nov
Multiple Airlines Logo
15:30 - 20:35PHL-LHR
24h 05m2 stops
Multiple Airlines Logo
06:50 - 14:47LHR-PHL
12h 57m2 stops
£436Multiple Airlines
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Sun, 9 Nov - Thu, 20 Nov
Multiple Airlines Logo
15:30 - 07:10PHL-LHR
10h 40m1 stop
Multiple Airlines Logo
06:50 - 14:47LHR-PHL
12h 57m2 stops
£442Multiple Airlines
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Sun, 9 Nov - Thu, 20 Nov
SWISS Logo
12:40 - 08:05PHL-LHR
38h 25m2 stops
SWISS Logo
17:10 - 21:21LHR-PHL
33h 11m2 stops
£442SWISS
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Wed, 12 Nov - Mon, 17 Nov
SWISS Logo
12:40 - 13:00PHL-LHR
19h 20m2 stops
SWISS Logo
13:45 - 21:21LHR-PHL
36h 36m2 stops
£443SWISS
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Wed, 12 Nov - Mon, 17 Nov
American Airlines Logo
18:35 - 06:35PHL-LHR
7h 00mdirect
American Airlines Logo
07:50 - 13:55LHR-PHL
11h 05m1 stop
£452American Airlines
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Sun, 9 Nov - Tue, 18 Nov
American Airlines Logo
18:35 - 06:35PHL-LHR
7h 00mdirect
American Airlines Logo
07:50 - 13:55LHR-PHL
11h 05m1 stop
£453American Airlines
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Sun, 9 Nov - Tue, 18 Nov
Aer Lingus Logo
17:30 - 10:10PHL-LHR
11h 40m1 stop
Aer Lingus Logo
08:50 - 16:00LHR-PHL
12h 10m1 stop
£457Aer Lingus
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Wed, 26 Nov - Wed, 3 Dec

Air Canada flights from Philadelphia to London Heathrow Airport

Our best Air Canada deals on Philadelphia to London Heathrow Airport flight tickets
Air Canada
9 Nov
PHL15:30Philadelphia
24h 05m
2 stops
LHR20:35London Heathrow
18 Nov
LHR09:00London Heathrow
18h 46m
2 stops
PHL22:46Philadelphia
£420
Find similar
Air Canada
9 Nov
PHL09:20Philadelphia
40h 50m
2 stops
LHR07:10London Heathrow
18 Nov
LHR12:05London Heathrow
39h 41m
2 stops
PHL22:46Philadelphia
£424
Find similar
Air Canada
9 Nov
PHL15:30Philadelphia
10h 40m
1 stop
LHR07:10London Heathrow
18 Nov
LHR06:50London Heathrow
12h 57m
2 stops
PHL14:47Philadelphia
£424
Find similar

Virgin Atlantic flights from Philadelphia to London Heathrow Airport

Our best Virgin Atlantic deals on Philadelphia to London Heathrow Airport flight tickets
Virgin Atlantic
9 Nov
PHL14:30Philadelphia
12h 20m
1 stop
LHR07:50London Heathrow
18 Nov
LHR06:30London Heathrow
15h 13m
2 stops
PHL16:43Philadelphia
£417
Find similar
Virgin Atlantic
9 Nov
PHL11:43Philadelphia
14h 07m
1 stop
LHR06:50London Heathrow
18 Nov
LHR11:30London Heathrow
16h 36m
2 stops
PHL23:06Philadelphia
£444
Find similar
Virgin Atlantic
25 Oct
PHL18:18Philadelphia
32h 07m
1 stop
LHR07:25London Heathrow
5 Nov
LHR08:55London Heathrow
13h 18m
1 stop
PHL17:13Philadelphia
£487
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 24 October 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

Sun 9/11

14:30-07:50

1 stop12h 20m

London Heathrow

Tue 18/11

06:30-16:43

2 stops15h 13m

£417

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 9/11

15:30-20:35

2 stops24h 05m

London Heathrow

Tue 18/11

09:00-22:46

2 stops18h 46m

£420

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 9/11

09:20-07:10

2 stops40h 50m

London Heathrow

Tue 18/11

12:05-22:46

2 stops39h 41m

£424

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 9/11

15:30-20:35

2 stops24h 05m

London Heathrow

Thu 20/11

06:50-14:47

2 stops12h 57m

£436

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 9/11

15:30-07:10

1 stop10h 40m

London Heathrow

Thu 20/11

06:50-14:47

2 stops12h 57m

£442

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 12/11

12:40-08:05

2 stops38h 25m

London Heathrow

Mon 17/11

17:10-21:21

2 stops33h 11m

£442

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 12/11

12:40-13:00

2 stops19h 20m

London Heathrow

Mon 17/11

13:45-21:21

2 stops36h 36m

£443

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 9/11

18:35-06:35

Nonstop7h 00m

London Heathrow

Tue 18/11

07:50-13:55

1 stop11h 05m

£452

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 9/11

18:35-06:35

Nonstop7h 00m

London Heathrow

Tue 18/11

07:50-13:55

1 stop11h 05m

£453

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 26/11

17:30-10:10

1 stop11h 40m

London Heathrow

Wed 3/12

08:50-16:00

1 stop12h 10m

£457

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 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 £493. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Philadelphia averaging around £517.

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 £513. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Thursday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Thursday 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 £544. 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 £642 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 £614 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 £525 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 63% 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 October 2025, prices for Philadelphia to London Heathrow Airport flights are approximately 48% 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

£676

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 £676
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
7,469 reviews
Search British Airways flights
Aer LingusPriceFrom £394Free CancellationRating
7.2
1,353 reviews
Search Aer Lingus flights
JetBluePriceFrom £429Free CancellationRating
7.2
2,908 reviews
Search JetBlue flights
IberiaPriceFrom £465Free CancellationRating
7.0
2,997 reviews
Search Iberia flights
American AirlinesPriceFrom £512Free CancellationRating
7.2
11,033 reviews
Search American Airlines flights

  • Aer Lingus Flights From Philadelphia to London Heathrow Airport

    Aer Lingus flies from Philadelphia to London Heathrow Airport around 3 times per week, with 1,353 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 £394 (round-trip), much lower than the average airfare cost of £737 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 £512, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at £669 round-trip. American Airlines operates 8 flights out of Philadelphia into London Heathrow Airport in an average week, so prices vary by time and availability. 11,033 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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