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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 12/1. 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

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JetBlue Logo
13:30 - 06:55
PHL
-
LHR
12h 25m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£458JetBlue
Mon, 12 Jan - Tue, 20 Jan
JetBlue Logo
08:40 - 06:55
PHL
-
LHR
17h 15m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£459JetBlue
Tue, 13 Jan - Tue, 20 Jan
JetBlue Logo
08:40 - 06:55
PHL
-
LHR
17h 15m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£460JetBlue
Sat, 31 Jan - Sat, 7 Feb
JetBlue Logo
08:40 - 06:55
PHL
-
LHR
17h 15m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£465JetBlue
Mon, 12 Jan - Tue, 20 Jan
JetBlue Logo
13:30 - 06:55
PHL
-
LHR
12h 25m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£467JetBlue
Mon, 12 Jan - Tue, 20 Jan
JetBlue Logo
08:40 - 06:55
PHL
-
LHR
17h 15m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£471JetBlue
Mon, 12 Jan - Tue, 20 Jan
JetBlue Logo
08:40 - 06:55
PHL
-
LHR
17h 15m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£472JetBlue
Mon, 12 Jan - Tue, 20 Jan
JetBlue Logo
13:30 - 06:55
PHL
-
LHR
12h 25m1 stop
JetBlue Logo
09:20 - 18:23
LHR
-
PHL
14h 03m1 stop
£478JetBlue
Thu, 29 Jan - Tue, 10 Feb
JetBlue Logo
08:40 - 06:55
PHL
-
LHR
17h 15m1 stop
JetBlue Logo
09:20 - 22:36
LHR
-
PHL
18h 16m1 stop
£479JetBlue
Wed, 4 Feb - Wed, 25 Feb
JetBlue Logo
08:40 - 06:55
PHL
-
LHR
17h 15m1 stop
JetBlue Logo
09:20 - 12:35
LHR
-
PHL
32h 15m1 stop
£482JetBlue
Sun, 25 Jan - Sun, 1 Feb

Scandinavian Airlines flights from Philadelphia to London Heathrow Airport

Our best Scandinavian Airlines deals on Philadelphia to London Heathrow Airport flight tickets
Scandinavian Airlines
13 Jan
PHL11:30Philadelphia
16h 50m
2 stops
LHR09:20London Heathrow
20 Jan
LHR06:40London Heathrow
19h 36m
2 stops
PHL21:16Philadelphia
£492
Find similar
Scandinavian Airlines
27 Jan
PHL11:22Philadelphia
16h 58m
2 stops
LHR09:20London Heathrow
8 Feb
LHR19:30London Heathrow
30h 46m
2 stops
PHL21:16Philadelphia
£511
Find similar
Scandinavian Airlines
26 Feb
PHL06:00Philadelphia
22h 20m
2 stops
LHR09:20London Heathrow
2 Mar
LHR06:40London Heathrow
19h 33m
2 stops
PHL21:13Philadelphia
£517
Find similar

British Airways flights from Philadelphia to London Heathrow Airport

Our best British Airways deals on Philadelphia to London Heathrow Airport flight tickets
British Airways
18 Jan
PHL18:35Philadelphia
7h 00m
LHR06:35London Heathrow
24 Feb
LHR06:30London Heathrow
12h 30m
1 stop
PHL14:00Philadelphia
£513
Find similar
British Airways
18 Jan
PHL19:50Philadelphia
7h 00m
LHR07:50London Heathrow
10 Feb
LHR08:25London Heathrow
12h 15m
1 stop
PHL15:40Philadelphia
£520
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 18 December 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

Mon 12/1

13:30-06:55

1 stop12h 25m

London Heathrow

Tue 20/1

09:20-18:23

1 stop14h 03m

£458

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 13/1

08:40-06:55

1 stop17h 15m

London Heathrow

Tue 20/1

09:20-18:23

1 stop14h 03m

£459

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sat 31/1

08:40-06:55

1 stop17h 15m

London Heathrow

Sat 7/2

09:20-18:23

1 stop14h 03m

£460

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 12/1

08:40-06:55

1 stop17h 15m

London Heathrow

Tue 20/1

09:20-18:23

1 stop14h 03m

£465

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 12/1

13:30-06:55

1 stop12h 25m

London Heathrow

Tue 20/1

09:20-18:23

1 stop14h 03m

£467

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 12/1

08:40-06:55

1 stop17h 15m

London Heathrow

Tue 20/1

09:20-18:23

1 stop14h 03m

£471

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 12/1

08:40-06:55

1 stop17h 15m

London Heathrow

Tue 20/1

09:20-18:23

1 stop14h 03m

£472

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Thu 29/1

13:30-06:55

1 stop12h 25m

London Heathrow

Tue 10/2

09:20-18:23

1 stop14h 03m

£478

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 4/2

08:40-06:55

1 stop17h 15m

London Heathrow

Wed 25/2

09:20-22:36

1 stop18h 16m

£479

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 25/1

08:40-06:55

1 stop17h 15m

London Heathrow

Sun 1/2

09:20-12:35

1 stop32h 15m

£482

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 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 £491. 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 £501. 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 £742.

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 £542. 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 £613 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 £615 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 53% 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 December 2025, prices for Philadelphia to London Heathrow Airport flights are approximately 18% 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

£653

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 £653. The best return flight deal from Philadelphia to London Heathrow Airport found on momondo in the last 72 hours is £383.
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
7,586 reviews
Search British Airways flights
Aer LingusPriceFrom £393Free CancellationRating
7.2
1,399 reviews
Search Aer Lingus flights
JetBluePriceFrom £428Free CancellationRating
7.2
2,896 reviews
Search JetBlue flights
American AirlinesPriceFrom £511Free CancellationRating
7.2
11,054 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 1,399 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 £393 (round-trip), much lower than the average airfare cost of £531 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 £511, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at £667 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. 11,054 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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