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Cheap flights from Philadelphia to London Heathrow Airport from £224

PHL — LHR
1 Nov — 8 Nov1
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 Tuesday or Monday 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

Wed 11/1119:40 -
Nonstop7h 10m
Tue 24/1110:35 -
Nonstop8h 10m
Deal found 28/9£612
Fri 13/1110:27 -
1 stop15h 28m
Wed 23/1209:20 -
1 stop28h 19m
Deal found 1/10£647
Wed 28/1006:30 -
1 stop20h 25m
Wed 4/1109:20 -
1 stop29h 17m
Deal found 28/9£648
Mon 26/1010:27 -
1 stop16h 28m
Tue 3/1109:20 -
1 stop12h 48m
Deal found 28/9£649
Wed 25/1109:10 -
1 stop16h 45m
Mon 30/1109:50 -
1 stop11h 20m
Deal found 2/10£650
Tue 10/1110:27 -
1 stop15h 28m
Tue 8/1206:30 -
1 stop12h 35m
Deal found 28/9£650
Thu 3/1209:30 -
1 stop16h 25m
Mon 7/1206:30 -
1 stop12h 35m
Deal found 29/9£651
Wed 2/1209:30 -
1 stop16h 25m
Tue 8/1206:30 -
1 stop12h 35m
Deal found 2/10£652
Fri 4/1209:30 -
1 stop16h 25m
Thu 10/1209:20 -
1 stop14h 23m
Deal found 29/9£654

Find flight deals from Philadelphia to Heathrow

Round-trip from

£611

One-way from

£224

Popular in

June

Cheapest in

February

Average price

£804

Good round-trip deal

£616 or less

Good one-way deal

£348 or less
21/3-31/3
  • 21/3-31/3
  • 3 total stops
  • 24h 35m total
  • Philadelphia to London
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British Airways
  • British Airways
  • 16/2-31/12
  • 1 total stop
  • 17h 35m total
  • Philadelphia to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£164 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£25 potential savings vs. average return price).
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Average for round-trip flights in October 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

Sun 8/11

15:35-06:55

1 stop10h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£249

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Thu 26/11

12:45-06:55

1 stop13h 10m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£249

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Wed 10/3

09:54-06:55

1 stop16h 01m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£252

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Wed 30/12

09:29-06:56

1 stop16h 27m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£252

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Sun 28/3

12:15-06:30

1 stop13h 15m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£252

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Tue 30/3

12:15-06:30

1 stop13h 15m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£252
Fastest return journey

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Tue 30/3

18:45-06:50

Nonstop7h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£265

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Mon 29/3

18:45-06:50

Nonstop7h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£265

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Wed 10/3

13:00-09:00

2 stops15h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£268

PhiladelphiaLondon

PHL Philadelphia - LHR London Heathrow

PHLLHR

Philadelphia

Thu 31/12

09:50-08:25

2 stops17h 35m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£305

Flights are sorted by cheapest return flights first.

Deals found on 27/9

Showing 1-10 of 22 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 £532). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of £1,127). 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 £693 and £985 in March.
The cheapest return price found within the last 5 days was £611 on Multiple Airlines (21 Mar–31 Mar).

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
8,244 reviews
Check prices

Boarding

7.0

Comfort

6.8

Entertainment

6.5

Food

6.4

Overall

6.7

Crew

7.7

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
8,244 reviews
British Airways
6.7
Okay
8,244 reviews
Check prices

Boarding

7.0

Comfort

6.8

Entertainment

6.5

Food

6.4

Overall

6.7

Crew

7.7

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 11 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 £715, JetBlue can have you in London Heathrow Airport from Philadelphia in 7h 05m. 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 £519 on this airline. Users have found that British Airways is 33% cheaper than the other options available to this destination.

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

    Consider Malaysia Airlines (92%), American Airlines (88%) or British Airways (88%) 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 £271. On average you can expect to pay £560. The most popular route, (Philadelphia - London Heathrow), can usually be booked for £599.

  • 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 £532). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of £1,127). 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
Milton Keynes
Luton
Gatwick
Wembley
Slough
Ilford
Hayes
Croydon
Northampton
Colchester
Eastbourne
Enfield
Brentford
Southend-on-Sea
Barnet
Southall
Watford
Stratford-upon-Avon
Kingston upon Thames

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Philadelphia to Heathrow

AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£519Average£811FlexibilityNo 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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