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Cheap flights from Philadelphia to London from £185

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 23/2. 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.
British Airways Logo
18:45 - 06:50
PHL
-
LHR
7h 05mdirect
British Airways Logo
12:30 - 15:30
LHR
-
PHL
8h 00mdirect
£445British Airways
Wed, 1 Apr - Tue, 7 Apr
British Airways Logo
14:34 - 09:40
PHL
-
LHR
14h 06m1 stop
British Airways Logo
07:50 - 13:55
LHR
-
PHL
11h 05m1 stop
£446British Airways
Fri, 13 Feb - Thu, 19 Feb
Air Canada Logo
15:30 - 11:20
PHL
-
LHR
14h 50m2 stops
Air Canada Logo
06:50 - 14:47
LHR
-
PHL
12h 57m2 stops
£447Air Canada
Wed, 25 Feb - Wed, 4 Mar
Air Canada Logo
07:50 - 07:10
PHL
-
LHR
18h 20m2 stops
Air Canada Logo
06:50 - 14:47
LHR
-
PHL
12h 57m2 stops
£448Air Canada
Wed, 21 Jan - Tue, 27 Jan
Air Canada Logo
15:30 - 07:10
PHL
-
LHR
10h 40m1 stop
Air Canada Logo
09:00 - 14:47
LHR
-
PHL
33h 47m2 stops
£448Air Canada
Wed, 4 Mar - Wed, 18 Mar
United Airlines Logo
20:02 - 10:50
PHL
-
LHR
9h 48m1 stop
United Airlines Logo
13:25 - 14:47
LHR
-
PHL
30h 22m1 stop
£449United Airlines
Wed, 25 Feb - Wed, 4 Mar
United Airlines Logo
15:30 - 06:30
PHL
-
LHR
10h 00m1 stop
United Airlines Logo
09:30 - 14:16
LHR
-
PHL
33h 46m2 stops
£450United Airlines
Wed, 8 Apr - Tue, 14 Apr
Air Canada Logo
15:30 - 21:00
PHL
-
LHR
24h 30m2 stops
Air Canada Logo
08:40 - 22:44
LHR
-
PHL
19h 04m2 stops
£451Air Canada
Sun, 12 Apr - Thu, 30 Apr
British Airways Logo
15:59 - 08:00
PHL
-
LHR
11h 01m1 stop
British Airways Logo
19:10 - 17:40
LHR
-
PHL
27h 30m1 stop
£451British Airways
Wed, 1 Apr - Mon, 6 Apr
Air Canada Logo
15:30 - 20:35
PHL
-
LHR
24h 05m2 stops
Air Canada Logo
09:00 - 22:46
LHR
-
PHL
18h 46m2 stops
£452Air Canada
Tue, 3 Feb - Fri, 13 Feb

Air Canada flights from Philadelphia to London Heathrow Airport

Our best Air Canada deals on Philadelphia to London Heathrow Airport flight tickets
Air Canada
20 Jan
PHL07:50Philadelphia
18h 20m
2 stops
LHR07:10London Heathrow
5 Feb
LHR06:50London Heathrow
13h 00m
2 stops
PHL14:50Philadelphia
£447
Air Canada
21 Jan
PHL07:50Philadelphia
18h 20m
2 stops
LHR07:10London Heathrow
27 Jan
LHR06:50London Heathrow
12h 57m
2 stops
PHL14:47Philadelphia
£448
Air Canada
4 Mar
PHL15:30Philadelphia
10h 40m
1 stop
LHR07:10London Heathrow
18 Mar
LHR09:00London Heathrow
33h 47m
2 stops
PHL14:47Philadelphia
£448

United Airlines flights from Philadelphia to London Heathrow Airport

Our best United Airlines deals on Philadelphia to London Heathrow Airport flight tickets
United Airlines
25 Feb
PHL20:02Philadelphia
9h 48m
1 stop
LHR10:50London Heathrow
4 Mar
LHR13:25London Heathrow
30h 22m
1 stop
PHL14:47Philadelphia
£449
United Airlines
8 Apr
PHL15:30Philadelphia
10h 00m
1 stop
LHR06:30London Heathrow
14 Apr
LHR09:30London Heathrow
33h 46m
2 stops
PHL14:16Philadelphia
£450
United Airlines
22 Apr
PHL15:30Philadelphia
10h 00m
1 stop
LHR06:30London Heathrow
27 Apr
LHR13:40London Heathrow
38h 03m
2 stops
PHL22:43Philadelphia
£462

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 11 January 2026.
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

Wed 1/4

18:45-06:50

Nonstop7h 05m

London Heathrow

Tue 7/4

12:30-15:30

Nonstop8h 00m

£445

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 13/2

14:34-09:40

1 stop14h 06m

London Heathrow

Thu 19/2

07:50-13:55

1 stop11h 05m

£446

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 25/2

15:30-11:20

2 stops14h 50m

London Heathrow

Wed 4/3

06:50-14:47

2 stops12h 57m

£447

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 21/1

07:50-07:10

2 stops18h 20m

London Heathrow

Tue 27/1

06:50-14:47

2 stops12h 57m

£448

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 4/3

15:30-07:10

1 stop10h 40m

London Heathrow

Wed 18/3

09:00-14:47

2 stops33h 47m

£448

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 25/2

20:02-10:50

1 stop9h 48m

London Heathrow

Wed 4/3

13:25-14:47

1 stop30h 22m

£449

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 8/4

15:30-06:30

1 stop10h 00m

London Heathrow

Tue 14/4

09:30-14:16

2 stops33h 46m

£450

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 12/4

15:30-21:00

2 stops24h 30m

London Heathrow

Thu 30/4

08:40-22:44

2 stops19h 04m

£451

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 1/4

15:59-08:00

1 stop11h 01m

London Heathrow

Mon 6/4

19:10-17:40

1 stop27h 30m

£451

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 3/2

15:30-20:35

2 stops24h 05m

London Heathrow

Fri 13/2

09:00-22:46

2 stops18h 46m

£452

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 £490. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Philadelphia averaging around £495.

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 £498. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £740.

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 in the evening. momondo users have found flights departing from Philadelphia to London Heathrow Airport in the evening for as low as £568. 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 £576 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 £616 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 £510 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 32% 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 January 2026, prices for Philadelphia to London Heathrow Airport flights are approximately 1% 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

£417

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 £417. The best return flight deal from Philadelphia to London Heathrow Airport found on momondo in the last 72 hours is £528.
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 £385Free CancellationRating
6.7
7,666 reviews
Search British Airways flights
Aer LingusPriceFrom £392Free CancellationRating
7.2
1,432 reviews
Search Aer Lingus flights
JetBluePriceFrom £427Free CancellationRating
7.2
2,888 reviews
Search JetBlue flights
American AirlinesPriceFrom £510Free CancellationRating
7.2
11,099 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 1,432 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 £392 (round-trip), much lower than the average airfare cost of £530 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 £510, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at £665 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. 11,100 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.

An easier way to manage your London Heathrow Airport trip

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