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Cheap flights from Philadelphia to London Heathrow Airport from £218

PHL — LHR
10 Dec — 17 Dec1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Philadelphia to London Heathrow are usually found in February or January, booked 77 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap flight deals from Philadelphia to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Philadelphia to Heathrow

Sun 6/1209:30 -
1 stop16h 25m
Mon 11/109:20 -
1 stop15h 18m
Deal found 5/11£610
Mon 16/1110:27 -
1 stop15h 28m
Wed 12/508:40 -
1 stop15h 12m
Deal found 7/11£614
Sun 15/1107:00 -
1 stop18h 55m
Thu 19/1109:20 -
1 stop14h 34m
Deal found 5/11£618
Thu 3/1209:30 -
1 stop16h 25m
Sun 6/1209:20 -
1 stop14h 23m
Deal found 5/11£619
Wed 25/1119:45 -
1 stop30h 10m
Wed 9/1209:20 -
1 stop14h 23m
Deal found 5/11£622
Mon 16/1110:27 -
1 stop15h 28m
Mon 23/1109:20 -
1 stop14h 34m
Deal found 8/11£623
Sat 5/1219:33 -
1 stop30h 22m
Tue 8/1209:20 -
1 stop14h 23m
Deal found 5/11£627
Fri 4/1219:33 -
1 stop30h 22m
Tue 8/1209:20 -
1 stop14h 23m
Deal found 9/11£628
Tue 8/1209:30 -
1 stop16h 25m
Sat 23/109:20 -
1 stop14h 38m
Deal found 8/11£629
Sat 14/1115:35 -
1 stop10h 20m
Thu 19/1109:20 -
1 stop14h 34m
Deal found 5/11£632

Find flight deals from Philadelphia to Heathrow

Round-trip from

£610

One-way from

£218

Popular in

June

Cheapest in

February

Average price

£803

Good round-trip deal

£896 or less

Good one-way deal

£886 or less
JetBlue
  • JetBlue
  • 13/1-17/1
  • 2 total stops
  • 25h 33m total
  • Philadelphia to London
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JetBlue
  • JetBlue
  • 7/12-31/12
  • 1 total stop
  • 16h 25m total
  • Philadelphia to London
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£149 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£22 potential savings vs. average return price).
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Average for round-trip flights in November 2026
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Price to beat on a round-trip flight from Philadelphia to London Heathrow.
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Price to beat on a one-way flight from Philadelphia to London Heathrow.
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Cheapflights Fare Finder

 
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

Cheapest return flight

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Tue 8/12

09:30-06:55

1 stop16h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£223

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Tue 23/3

14:37-09:10

2 stops14h 33m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£268

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Sat 1/5

16:30-07:25

2 stops33h 55m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£271

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Sun 22/11

13:25-06:55

1 stop12h 30m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£363

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Tue 2/2

09:30-19:30

2 stops29h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£390

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Sun 10/1

15:38-17:30

3 stops20h 52m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£460

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Wed 16/12

15:20-07:10

1 stop10h 50m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£486

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Sun 27/12

18:51-06:20

2 stops30h 29m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£492
Fastest return journey

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Sun 13/12

18:35-06:35

Nonstop7h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£530

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Mon 28/12

18:35-06:35

Nonstop7h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£530

Flights are sorted by cheapest return flights first.

Deals found on 9/11

Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Philadelphia to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Philadelphia with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to London Heathrow Airport

How far ahead should I book a flight from Philadelphia to London Heathrow Airport?

The best time to book flights from Philadelphia to London Heathrow Airport is 76 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Philadelphia to London Heathrow Airport?

Currently, February is the cheapest month in which you can book a flight from Philadelphia to London Heathrow Airport (average of £547). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of £1,111). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PHL to LHR?

When flying from Philadelphia to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from Philadelphia to London Heathrow Airport?

Airfare is below average for this route at the moment.

Philadelphia to London Heathrow Airport flights typically cost between £671 and £958 in January.
The cheapest return price found within the last 5 days was £610 on JetBlue (13 Jan–17 Jan).

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with British Airways from Philadelphia to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
8,286 reviews
Check prices

Boarding

7.0

Crew

7.7

Entertainment

6.5

Food

6.4

Comfort

6.8

Overall

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.
British Airways
6.7
Okay
8,286 reviews
British Airways
6.7
Okay
8,286 reviews
Check prices

Boarding

7.0

Crew

7.7

Entertainment

6.5

Food

6.4

Comfort

6.8

Overall

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.

Related info for your journey

  • What airport do you fly from for flights from Philadelphia to London Heathrow?

    Philadelphia (PHL) is the airport you will fly out of if you book a flight from Philadelphia to London Heathrow. You should not have trouble finding flights to London Heathrow from Philadelphia; the airport handles an average of 10 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights from the Philadelphia airport to London Heathrow. It is only a 7.0 mi journey to Philadelphia (PHL) from Philadelphia’s city center.

  • How long is the flight from Philadelphia to London Heathrow Airport?

    For as low as £644, JetBlue can have you in London Heathrow Airport from Philadelphia in 16h 25m. Philadelphia and London Heathrow Airport are separated by a distance of 3533 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What is the cheapest airline to fly from Philadelphia to London Heathrow Airport round-trip?

    Our cheapest airline available from Philadelphia to London Heathrow Airport is British Airways. Our recent data shows that you can find tickets from as low as £561 on this airline. Users have found that British Airways is 29% cheaper than the other options available to this destination.

  • What are the most reliable airlines from Philadelphia to London Heathrow Airport?

    Consider Malaysia Airlines (93%), American Airlines (92%) or British Airways (92%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to London Heathrow Airport.

  • What are the cheapest flights from Philadelphia to London Heathrow Airport?

    The cheapest flight price from Philadelphia to London Heathrow Airport is £434. On average you can expect to pay £942. The most popular route, (Philadelphia - London Heathrow), can usually be booked for £585.

  • Can I find deals for flights from Philadelphia to Heathrow that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Heathrow.

  • Can I find deals for business class flights from Philadelphia to Heathrow?

    Yes. Cheapflights offers flight deals from Philadelphia to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Philadelphia to London Heathrow Airport?

    Currently, February is the cheapest month in which you can book a flight from Philadelphia to London Heathrow Airport (average of £547). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of £1,111). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Luton
Milton Keynes
Wembley
Gatwick
Slough
Ilford
Hayes
Croydon
Eastbourne
Northampton
Barnet
Brentford
Southend-on-Sea
Enfield
Southall
Harrow
Watford
Folkestone
Dagenham

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Philadelphia to Heathrow

AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£561Average£876FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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How does Cheapflights help users find flights from Philadelphia to Heathrow?

Cheapflights makes it easy to find Philadelphia to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Philadelphia to Heathrow?

Millions of users choose and trust Cheapflights to book the best flight deals from Philadelphia to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Philadelphia to Heathrow with no change fees?

Need flexible booking options for your flight to Heathrow from Philadelphia? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Philadelphia to Heathrow become cheaper?

Yes! Start tracking prices for Philadelphia to Heathrow flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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