Cheap flights from London Heathrow Airport to Philadelphia from £226

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PHL
2 Jan — 9 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London Heathrow to Philadelphia are usually found in March or February, booked 25 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from Heathrow to Philadelphia

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Philadelphia
Explore the most affordable flight options available from Heathrow to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 December 2025.

Mon 15/1206:30LHR - PHL
2 stops19h 40mUnited Airlines
Thu 15/116:35PHL - LHR
2 stops23h 00mUnited Airlines
Deal found 29/11£544
Wed 10/1207:20LHR - PHL
1 stop12h 55mAmerican Airlines
Thu 25/1213:41PHL - LHR
1 stop11h 09mAmerican Airlines
Deal found 1/12£544
Mon 15/1213:50LHR - PHL
1 stop29h 48mFinnair
Mon 29/1221:15PHL - LHR
1 stop12h 25mFinnair
Deal found 30/11£545
Wed 10/1210:05LHR - PHL
Nonstop8h 00mBritish Airways
Thu 25/1208:25PHL - LHR
1 stop21h 50mBritish Airways
Deal found 1/12£549
Tue 16/1206:30LHR - PHL
1 stop14h 30mBritish Airways
Thu 25/1208:25PHL - LHR
1 stop21h 50mBritish Airways
Deal found 1/12£550
Mon 15/1213:25LHR - PHL
2 stops31h 24mAir Canada
Thu 15/115:30PHL - LHR
1 stop10h 40mAir Canada
Deal found 29/11£553
Wed 24/1215:30LHR - PHL
1 stop29h 35mUnited Airlines
Wed 14/107:50PHL - LHR
2 stops31h 45mUnited Airlines
Deal found 1/12£554
Thu 11/1210:05LHR - PHL
Nonstop8h 00mFinnair
Sat 13/1221:20PHL - LHR
1 stop28h 40mFinnair
Deal found 1/12£556
Mon 29/1208:15LHR - PHL
1 stop12h 20mBritish Airways
Mon 12/115:35PHL - LHR
1 stop10h 25mBritish Airways
Deal found 2/12£559
Tue 16/1213:25LHR - PHL
2 stops38h 21mAir Canada
Thu 15/115:30PHL - LHR
2 stops48h 05mAir Canada
Deal found 30/11£563
Tue 16/1209:00LHR - PHL
2 stops17h 10mMultiple Airlines
Thu 15/117:40PHL - LHR
1 stop11h 05mMultiple Airlines
Deal found 1/12£564

Find flight deals from Heathrow to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Philadelphia (PHL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 3 December 2025.

Round-trip from

£544

One-way from

£226

Popular in

December

Cheapest in

March

Average price

£704

Good round-trip deal

£601 or less

Good one-way deal

£508 or less
American Airlines
  • American Airlines
  • 23/1-26/1
  • Nonstop
  • 15h 15m total
  • London to Philadelphia
29/1
  • 29/1
  • 3 total stops
  • 41h 37m total
  • London to Philadelphia
Highest demand for flights based on searches. 5% potential increase in price (£24 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Average for round-trip flights in December 2025
Price to beat on a round-trip flight from London Heathrow to Philadelphia.
Price to beat on a one-way flight from London Heathrow to Philadelphia.

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Philadelphia 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, Cheapflights users made 858,174 searches. Data last updated 3 December 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Philadelphia that are best for you.

Fly from

Heathrow

Fly to

Philadelphia

Route

Depart

Return

Price

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 15/12

06:30-21:10

2 stops19h 40m

Philadelphia

Thu 15/1

16:35-20:35

2 stops23h 00m

£544

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 23/12

15:05-15:35

1 stop29h 30m

Philadelphia

Mon 29/12

21:15-07:25

1 stop29h 10m

£590

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 9/1

11:10-22:46

1 stop16h 36m

Philadelphia

Sat 10/1

17:00-07:55

1 stop33h 55m

£594

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 29/12

17:45-15:35

1 stop26h 50m

Philadelphia

Mon 12/1

19:50-07:50

Nonstop7h 00m

£598

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 16/12

08:30-19:08

2 stops15h 38m

Philadelphia

Tue 6/1

10:30-05:55

2 stops14h 25m

£602

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 24/12

07:30-23:30

2 stops21h 00m

Philadelphia

Sun 28/12

07:50-08:30

1 stop19h 40m

£619

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 15/12

06:30-16:56

2 stops15h 26m

Philadelphia

Tue 23/12

07:05-07:50

1 stop19h 45m

£628

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 30/12

15:30-17:28

2 stops30h 58m

Philadelphia

Tue 6/1

17:00-05:55

1 stop31h 55m

£628

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 12/2

07:05-00:26

3 stops22h 21m

Philadelphia

Thu 26/2

11:08-09:20

2 stops17h 12m

£631

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 16/1

06:40-00:21

3 stops22h 41m

Philadelphia

Fri 23/1

06:02-09:20

2 stops22h 18m

£633

Flights are sorted by cheapest return flights first.

Deals found on 2/12

Showing 1-10 of 22 results
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Best time to book a flight from Heathrow to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Heathrow with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a return flight from Heathrow to Philadelphia. Price data was last updated on 28 November 2025.

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Philadelphia, you should look to book at least 25 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Philadelphia (average of £309). Flying from London Heathrow Airport to Philadelphia in June is currently the most expensive (average of £347). 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 LHR to PHL?

Find hourly flight availability from Heathrow to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 December 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Philadelphia in the afternoon. If you’re flexible enough to do this you can expect to save up to 20% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from London Heathrow Airport to Philadelphia?

Use this chart to determine the cheapest time to fly return from Heathrow to Philadelphia. Price data was last updated on 29 November 2025.

Travellers seeking maximum savings on their London Heathrow Airport to Philadelphia flight should consider departing on Friday afternoons when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Philadelphia. Reviews last updated 3 December 2025.
Get a feel of what it's like to fly with Finnair, United Airlines, andAer Lingus from London Heathrow Airport to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

7.6

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly into for flights to Philadelphia from London Heathrow?

    Most people fly into Philadelphia (PHL) if they book a flight to Philadelphia from London Heathrow. On average, Philadelphia has 8 inbound flights from London Heathrow per day from 10 airlines. Philadelphia is conveniently located just 7.0 mi from Philadelphia’s city center.

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

    Airlines like United Airlines and British Airways fly from London Heathrow Airport to Philadelphia in about 19h 40m. The time it takes to get you to your destination can typically vary by up to 9h 50m. The distance between London Heathrow Airport and Philadelphia is about 3533 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London Heathrow Airport to Philadelphia round-trip?

    Our cheapest airline available from London Heathrow Airport to Philadelphia is United Airlines. Our recent data shows that you can find tickets from as low as £307 on this airline. Additional options worth looking into are Air Canada and JetBlue, starting at £343 and £397 round-trip. United Airlines is currently priced 46% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London Heathrow Airport to Philadelphia one-way?

    The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as £364. However, be on the lookout for offers from Aer Lingus and Iberia, as they are both options that can get you from London Heathrow Airport to Philadelphia for a low price.

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

    Consider Malaysia Airlines (89%), American Airlines (85%) or Iberia (85%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Philadelphia.

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

    The cheapest flight price from London Heathrow Airport to Philadelphia is £404. On average you can expect to pay £831. The most popular route, (London Heathrow - Philadelphia), can usually be booked for £417.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow to Philadelphia 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 London Heathrow Airport to Philadelphia?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Philadelphia (average of £309). Flying from London Heathrow Airport to Philadelphia in June is currently the most expensive (average of £347). 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

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Fly from Heathrow to Philadelphia on these airlines

Choose from the following airlines for your flight from Heathrow to Philadelphia. Flights are based on user searches made on Cheapflights and were last updated on 3 December 2025.

Top 10 airlines flying from Heathrow to Philadelphia

Discover the top 10 airlines that operate flights from Heathrow to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 3 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£307Average£414FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest£343Average£477FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
JetBlueCheapest£397Average£583FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
LufthansaCheapest£408Average£517FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£444Average£559FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£454Average£561FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£459Average£607FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Aer LingusCheapest£471Average£676FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IberiaCheapest£476Average£569FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Virgin AtlanticCheapest£485Average£529FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

When you search for this flight from Heathrow to Philadelphia, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Philadelphia 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 Heathrow to Philadelphia with no change fees?

Need flexible booking options for your flight to Philadelphia from Heathrow? 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 Heathrow to Philadelphia become cheaper?

Yes! Start tracking prices for Heathrow to Philadelphia 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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