Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Philadelphia to London from £238

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 1/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Philadelphia to London (PHL-LHR)

Cheap return flights

American Airlines Logo
14:00 - 07:50PHL-LHR
12h 50m1 stop
American Airlines Logo
07:50 - 14:45LHR-PHL
10h 55m1 stop
£363American Airlines
Find Deal
Wed, 22 Oct - Fri, 31 Oct
American Airlines Logo
16:05 - 06:30PHL-LHR
9h 25m1 stop
American Airlines Logo
07:50 - 13:55LHR-PHL
11h 05m1 stop
£364American Airlines
Find Deal
Tue, 11 Nov - Tue, 18 Nov
Finnair Logo
18:30 - 06:40PHL-LHR
7h 10mdirect
Finnair Logo
13:10 - 17:15LHR-PHL
8h 05mdirect
£366Finnair
Find Deal
Wed, 22 Oct - Fri, 31 Oct
Aer Lingus Logo
20:30 - 12:40PHL-LHR
11h 10m1 stop
Aer Lingus Logo
13:25 - 19:00LHR-PHL
10h 35m1 stop
£371Aer Lingus
Find Deal
Wed, 3 Sep - Wed, 10 Sep
British Airways Logo
15:55 - 07:50PHL-LHR
10h 55m1 stop
British Airways Logo
13:30 - 16:25LHR-PHL
7h 55mdirect
£374British Airways
Find Deal
Mon, 1 Sep - Tue, 9 Sep
British Airways Logo
22:15 - 10:20PHL-LHR
7h 05mdirect
British Airways Logo
10:05 - 13:10LHR-PHL
8h 05mdirect
£376British Airways
Find Deal
Wed, 22 Oct - Tue, 4 Nov
Iberia Logo
19:45 - 07:50PHL-LHR
7h 05mdirect
Iberia Logo
15:45 - 15:35LHR-PHL
28h 50m1 stop
£376Iberia
Find Deal
Sun, 15 Feb - Thu, 26 Feb
Iberia Logo
18:30 - 06:40PHL-LHR
7h 10mdirect
Iberia Logo
17:25 - 15:35LHR-PHL
27h 10m1 stop
£377Iberia
Find Deal
Sun, 19 Oct - Tue, 25 Nov
Finnair Logo
22:15 - 10:20PHL-LHR
7h 05mdirect
Finnair Logo
13:30 - 16:25LHR-PHL
7h 55mdirect
£379Finnair
Find Deal
Wed, 1 Oct - Tue, 7 Oct
Aer Lingus Logo
18:30 - 08:05PHL-LHR
9h 35m1 stop
Aer Lingus Logo
07:50 - 16:00LHR-PHL
13h 10m1 stop
£388Aer Lingus
Find Deal
Mon, 27 Oct - Sun, 9 Nov

American Airlines flights from Philadelphia to London Heathrow Airport

Our best American Airlines deals on Philadelphia to London Heathrow Airport flight tickets
American Airlines
22 Oct
PHL14:00Philadelphia
12h 50m
1 stop
LHR07:50London Heathrow
31 Oct
LHR07:50London Heathrow
10h 55m
1 stop
PHL14:45Philadelphia
£363
Find similar
American Airlines
11 Nov
PHL16:05Philadelphia
9h 25m
1 stop
LHR06:30London Heathrow
18 Nov
LHR07:50London Heathrow
11h 05m
1 stop
PHL13:55Philadelphia
£364
Find similar
American Airlines
29 Oct
PHL14:00Philadelphia
12h 30m
1 stop
LHR06:30London Heathrow
5 Nov
LHR07:50London Heathrow
11h 05m
1 stop
PHL13:55Philadelphia
£365
Find similar

Aer Lingus flights from Philadelphia to London Heathrow Airport

Our best Aer Lingus deals on Philadelphia to London Heathrow Airport flight tickets
Aer Lingus
3 Sept
PHL20:30Philadelphia
11h 10m
1 stop
LHR12:40London Heathrow
10 Sept
LHR13:25London Heathrow
10h 35m
1 stop
PHL19:00Philadelphia
£371
Find similar
Aer Lingus
27 Oct
PHL18:30Philadelphia
9h 35m
1 stop
LHR08:05London Heathrow
9 Nov
LHR07:50London Heathrow
13h 10m
1 stop
PHL16:00Philadelphia
£388
Find similar
Aer Lingus
3 Sept
PHL20:30Philadelphia
11h 10m
1 stop
LHR12:40London Heathrow
6 Sept
LHR08:50London Heathrow
15h 10m
1 stop
PHL19:00Philadelphia
£391
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 22 August 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

Wed 22/10

14:00-07:50

1 stop12h 50m

London Heathrow

Fri 31/10

07:50-14:45

1 stop10h 55m

£363

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 11/11

16:05-06:30

1 stop9h 25m

London Heathrow

Tue 18/11

07:50-13:55

1 stop11h 05m

£364

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 22/10

18:30-06:40

Nonstop7h 10m

London Heathrow

Fri 31/10

13:10-17:15

Nonstop8h 05m

£366

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 3/9

20:30-12:40

1 stop11h 10m

London Heathrow

Wed 10/9

13:25-19:00

1 stop10h 35m

£371

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 1/9

15:55-07:50

1 stop10h 55m

London Heathrow

Tue 9/9

13:30-16:25

Nonstop7h 55m

£374

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 22/10

22:15-10:20

Nonstop7h 05m

London Heathrow

Tue 4/11

10:05-13:10

Nonstop8h 05m

£376

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 15/2

19:45-07:50

Nonstop7h 05m

London Heathrow

Thu 26/2

15:45-15:35

1 stop28h 50m

£376

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 19/10

18:30-06:40

Nonstop7h 10m

London Heathrow

Tue 25/11

17:25-15:35

1 stop27h 10m

£377

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 1/10

22:15-10:20

Nonstop7h 05m

London Heathrow

Tue 7/10

13:30-16:25

Nonstop7h 55m

£379

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 27/10

18:30-08:05

1 stop9h 35m

London Heathrow

Sun 9/11

07:50-16:00

1 stop13h 10m

£388

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 £511. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Philadelphia averaging around £530.

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 £500. 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 £746.

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 £539. 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 £655 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 £537 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 26% 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 August 2025, prices for Philadelphia to London Heathrow Airport flights are approximately 6% 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

£302

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 £302. The best return flight deal from Philadelphia to London Heathrow Airport found on momondo in the last 72 hours is £384.
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
JetBluePriceFrom £426Free CancellationRating
7.2
2,916 reviews
Search JetBlue flights
British AirwaysPriceFrom £443Free CancellationRating
6.7
7,292 reviews
Search British Airways flights
IberiaPriceFrom £461Free CancellationRating
7.0
2,884 reviews
Search Iberia flights
Aer LingusPriceFrom £492Free CancellationRating
7.1
1,228 reviews
Search Aer Lingus flights
American AirlinesPriceFrom £508Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

  • American Airlines Flights From Philadelphia to London Heathrow Airport

    American Airlines flies from Philadelphia to London Heathrow Airport around 21 times per week, with 10,000 momondo users rating the airline 7.2/10. The cheapest American Airlines deal from Philadelphia to London Heathrow Airport in the last 72 hours was £683 (round-trip), much lower than the average airfare cost of £871 for American Airlines flights on this route.

  • Aer Lingus Flights From Philadelphia to London Heathrow Airport

    The best Aer Lingus deal for Philadelphia to London Heathrow Airport flight tickets found on momondo in the last 72 hours was £662, round-trip. It should be noted that an average Aer Lingus flight deal for this route in this time was higher, at £1,041 round-trip. Aer Lingus operates 7 flights out of Philadelphia into London Heathrow Airport in an average week, so prices vary by time and availability. 1,228 Aer Lingus reviews by users on momondo have scored the airline at 7.1/10.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Northampton
Maidstone
Slough
Gatwick
Swindon
Canterbury
Stratford-upon-Avon
Southend-on-Sea
Ipswich
Ilford
Guildford
Swanage
Colchester
Worthing
Dartford
Hounslow
Poole

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

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 27/8
Wed 3/9
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London