Cheap flights from London Heathrow Airport to Philadelphia from £268

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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PHL
12 Jan — 19 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 13 December 2025.

Wed 31/1213:30LHR - PHL
1 stop31h 35mUnited Airlines
Thu 8/113:10PHL - LHR
1 stop13h 45mUnited Airlines
Deal found 13/12£573
Mon 29/1206:05LHR - PHL
1 stop14h 05mFinnair
Mon 12/121:31PHL - LHR
1 stop28h 29mFinnair
Deal found 11/12£575
Wed 31/1213:30LHR - PHL
1 stop31h 35mUnited Airlines
Mon 5/117:00PHL - LHR
1 stop31h 55mUnited Airlines
Deal found 13/12£577
Mon 29/1209:00LHR - PHL
2 stops34h 50mAir Canada
Mon 12/107:50PHL - LHR
2 stops31h 45mAir Canada
Deal found 13/12£581
Thu 25/1214:10LHR - PHL
1 stop24h 31mFinnair
Thu 8/111:00PHL - LHR
1 stop14h 30mFinnair
Deal found 11/12£598
Fri 26/1206:30LHR - PHL
1 stop12h 25mBritish Airways
Thu 8/115:35PHL - LHR
1 stop10h 25mBritish Airways
Deal found 11/12£600
Mon 29/1209:40LHR - PHL
1 stop15h 14mVirgin Atlantic
Mon 12/117:17PHL - LHR
1 stop10h 28mVirgin Atlantic
Deal found 13/12£601

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 13 December 2025.

Round-trip from

£529

One-way from

£268

Popular in

December

Cheapest in

March

Average price

£684

Good round-trip deal

£582 or less

Good one-way deal

£501 or less
Finnair
  • Finnair
  • 27/1-3/2
  • Nonstop
  • 15h 15m total
  • London to Philadelphia
9/2
  • 9/2
  • 3 total stops
  • 36h 17m total
  • London to Philadelphia
Highest demand for flights based on searches. 5% potential increase in price (£23 potential increase over avg. return price).
Cheapest flight prices on average. 1% potential price decrease (£9 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 13 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

Thu 12/2

06:30-14:00

1 stop12h 30m

Philadelphia

Thu 26/2

19:45-07:50

Nonstop7h 05m

£540

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 6/4

15:30-16:00

1 stop29h 30m

Philadelphia

Mon 20/4

09:15-21:00

2 stops30h 45m

£542

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 6/2

07:50-14:05

1 stop11h 15m

Philadelphia

Mon 16/2

15:40-07:00

1 stop10h 20m

£543

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 12/1

13:35-14:05

1 stop29h 30m

Philadelphia

Mon 19/1

18:35-06:35

Nonstop7h 00m

£547

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 9/1

07:25-17:34

1 stop15h 09m

Philadelphia

Fri 16/1

07:50-09:20

2 stops20h 30m

£566

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 21/2

06:30-14:00

1 stop12h 30m

Philadelphia

Sat 7/3

15:40-07:00

1 stop10h 20m

£570

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 15/1

07:50-14:05

1 stop11h 15m

Philadelphia

Fri 30/1

18:35-06:35

Nonstop7h 00m

£573

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 22/1

10:15-13:30

Nonstop8h 15m

Philadelphia

Mon 26/1

15:45-09:40

1 stop12h 55m

£584

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 13/4

06:00-23:11

2 stops22h 11m

Philadelphia

Wed 13/5

15:15-17:45

3 stops21h 30m

£585

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 24/4

09:30-16:00

1 stop11h 30m

Philadelphia

Fri 8/5

10:05-06:30

1 stop15h 25m

£595

Flights are sorted by cheapest return flights first.

Deals found on 11/12

Showing 1-10 of 17 results
1
2

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 12 December 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 £342). 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 13 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 6 December 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 13 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.

Food

6.7

Overall

7.6

Comfort

7.4

Crew

8.1

Entertainment

6.9

Boarding

7.6

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.

Food

6.7

Overall

7.6

Comfort

7.4

Crew

8.1

Entertainment

6.9

Boarding

7.6

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.

Food

6.7

Overall

7.6

Comfort

7.4

Crew

8.1

Entertainment

6.9

Boarding

7.6

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.

Food

6.7

Overall

7.6

Comfort

7.4

Crew

8.1

Entertainment

6.9

Boarding

7.6

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.

Food

6.7

Overall

7.6

Comfort

7.4

Crew

8.1

Entertainment

6.9

Boarding

7.6

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.

Food

6.7

Overall

7.6

Comfort

7.4

Crew

8.1

Entertainment

6.9

Boarding

7.6

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 10 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 British Airways and United Airlines fly from London Heathrow Airport to Philadelphia in about 12h 30m. The time it takes to get you to your destination can typically vary by up to 17h. 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 £303 on this airline. Additional options worth looking into are Air Canada and JetBlue, starting at £339 and £402 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 £359. 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 £399. On average you can expect to pay £842. The most popular route, (London Heathrow - Philadelphia), can usually be booked for £402.

  • 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 £342). 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 13 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 13 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£303Average£409FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest£339Average£471FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
JetBlueCheapest£402Average£591FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
LufthansaCheapest£403Average£506FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£438Average£550FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£449Average£554FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£453Average£599FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Aer LingusCheapest£465Average£678FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IberiaCheapest£470Average£559FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Virgin AtlanticCheapest£479Average£523FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

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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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