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$549+ Cheap flights from London (LON) to Philadelphia (PHL)

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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PHL
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheapflights Tip: The best prices from London to Philadelphia are usually found in February or September, booked 16 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from London to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) 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 July 31, 2025.

Round-trip from

$636
(United Airlines)

One-way from

$549
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$848

Good round-trip deal

$742 or less

Good one-way deal

$785 or less
From London (LON) to Philadelphia
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One-way flight from London (LON) to Philadelphia
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Highest demand for flights based on searches. 8% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from London (LON) to Philadelphia.
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Price to beat on a one-way flight from London (LON) to Philadelphia.
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Find flight deals from London to Philadelphia

Cheapest flights from London to Philadelphia
Explore the most affordable flight options available from London to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/227:30 amLHR - PHL
2 stops19h 01mUnited Airlines
Mon 9/85:15 pmPHL - LHR
1 stop34h 05mUnited Airlines
Deal found 7/30$636
This SWISS deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/279:00 amLHR - PHL
2 stops41h 21mSWISS
Thu 12/41:15 pmPHL - LHR
2 stops37h 50mSWISS
Deal found 7/31$637
This Lufthansa deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/98:30 amLHR - PHL
1 stop12h 30mLufthansa
Sun 10/195:35 pmPHL - LHR
1 stop11h 05mLufthansa
Deal found 7/31$638
This JetBlue deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1312:10 pmLGW - PHL
1 stop14h 14mJetBlue
Sun 10/196:40 pmPHL - LGW
1 stop9h 55mJetBlue
Deal found 7/31$638
This Air Canada deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:50 amLHR - PHL
2 stops12h 57mAir Canada
Thu 12/43:30 pmPHL - LHR
2 stops14h 50mAir Canada
Deal found 7/30$639
This The Travel House deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/228:25 amLHR - PHL
1 stop30h 15mIcelandair
Mon 9/86:10 pmPHL - LHR
1 stop31h 20mIcelandair
Deal found 7/30$640
This Air Canada deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/26:50 amLHR - PHL
2 stops13h 59mMultiple Airlines
Sat 9/2010:35 amPHL - LHR
2 stops14h 55mMultiple Airlines
Deal found 7/31$644
This TravelUp deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/278:25 amLHR - PHL
1 stop13h 30mJetBlue
Wed 9/33:10 pmPHL - LHR
1 stop10h 20mJetBlue
Deal found 7/30$645
This Netflights deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2712:30 pmLHR - PHL
Nonstop8h 05mBritish Airways
Wed 9/103:40 pmPHL - LHR
1 stop10h 40mBritish Airways
Deal found 7/31$649
This Mytrip deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/86:05 pmLCY - PHL
2 stops26h 55mSWISS
Mon 9/155:35 pmPHL - LCY
2 stops13h 55mSWISS
Deal found 7/30$650
This Norse deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Norse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/272:00 pmLGW - PHL
1 stop31h 49mMultiple Airlines
Thu 12/47:00 amPHL - LGW
1 stop22h 00mMultiple Airlines
Deal found 7/31$652
This ChecknFly deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/172:25 pmLHR - PHL
1 stop31h 20mFinnair
Sun 8/246:39 pmPHL - LHR
1 stop32h 01mFinnair
Deal found 7/30$657

Cheapflights Fare Finder

 
Customize your flight search to find flights from London 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 2,558,603 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from London to Philadelphia that are best for you.

Fly from

London

Fly to

Philadelphia

Route

Depart

Return

Price

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 8/22

7:30 am-9:31 pm

2 stops19h 01m

Philadelphia

Mon 9/8

5:15 pm-8:20 am

1 stop34h 05m

$636

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 11/27

9:00 am-9:21 pm

2 stops41h 21m

Philadelphia

Thu 12/4

1:15 pm-8:05 am

2 stops37h 50m

$637

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 10/9

9:30 am-4:00 pm

1 stop11h 30m

Philadelphia

Fri 10/17

5:35 pm-4:40 pm

1 stop18h 05m

$638

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Mon 10/13

12:10 pm-9:24 pm

1 stop14h 14m

Philadelphia

Sun 10/19

6:40 pm-9:35 am

1 stop9h 55m

$638

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Thu 11/27

6:50 am-2:47 pm

2 stops12h 57m

Philadelphia

Thu 12/4

10:15 am-6:30 am

2 stops15h 15m

$639

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 8/22

8:25 am-9:40 am

1 stop30h 15m

Philadelphia

Mon 9/8

6:10 pm-6:30 am

1 stop31h 20m

$640

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 11/25

6:50 am-2:47 pm

2 stops12h 57m

Philadelphia

Sat 11/29

3:30 pm-11:20 am

2 stops14h 50m

$641

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 8/27

8:25 am-4:55 pm

1 stop13h 30m

Philadelphia

Wed 9/3

3:10 pm-6:30 am

1 stop10h 20m

$645

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 8/27

12:30 pm-3:35 pm

Nonstop8h 05m

Philadelphia

Wed 9/10

3:40 pm-7:20 am

1 stop10h 40m

$649

LondonPhiladelphia

LCY - PHL

LCYPHL

London City

Mon 9/8

6:05 pm-4:00 pm

2 stops26h 55m

Philadelphia

Mon 9/15

5:35 pm-12:30 pm

2 stops13h 55m

$650

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 40 results
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The best insider tips for London to Philadelphia flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your London to Philadelphia trip
Airports
LHR

Expect strict security at Heathrow. Ensure all liquids are in one small bag to avoid delays during manual screening.

Read more about LHRby Ramsey Qubein
PHL

Use SEPTA trains for efficient travel to Center City Philadelphia. Stations are near Terminals A, B, C/D, and E/F.

Read more about PHLby Mark Chesnut
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut

Mark Chesnut

Mark Chesnut is a travel writer and public speaker with more than 30 years of experience. The 2019 winner of the NLGJA Excellence in Travel Writing Award, Mark is the author of the book “Prepare for Departure” and has covered air travel for multiple top consumer and trade media outlets.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Best time to book a flight from London to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from London with our price prediction graph.
Estimated round-trip 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 to Philadelphia

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

Use this chart to determine the optimal time to book a round-trip flight from London to Philadelphia. Price data was last updated on July 25, 2025.

The best time to book flights from London to Philadelphia is 16 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 London to Philadelphia?

Currently, August is the cheapest month in which you can book a flight from London to Philadelphia (average of $236). Flying from London to Philadelphia in March is currently the most expensive (average of $295). 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 LON to PHL?

Find hourly flight availability from London 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 July 31, 2025.

When flying from London to Philadelphia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 15% versus a flight at noon.

Weekly flight availability from London to Philadelphia

Explore weekly flight availability from London to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 31, 2025.

The most flights from LON to PHL are scheduled on a Monday (15 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (10 on average).

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 July 31, 2025.
Get a feel of what it's like to fly with Delta, Finnair, and SWISS from London 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.
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
SWISS
7.5
Good
1,686 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,900 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Related info for your journey

Find useful and relevant information for your journey from London 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?

    Located just 7.0 mi from the city center, Philadelphia is the airport most travelers will use when flying to Philadelphia from London. Booking flights from London to Philadelphia (PHL) should be relatively easy as there are 14 daily inbound flights from London from 5 different airlines.

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

    According to our current data, United Airlines ($636), SWISS ($637), and Lufthansa ($638) offers the cheapest pricing from London to Philadelphia. You may be able to fly from London to Philadelphia for 14% less than the average price by searching for these airlines.

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

    The cheapest airlines for a one-way flight from London to Philadelphia are Aer Lingus ($551), JetBlue ($622), and TAP AIR PORTUGAL ($663).

  • What are the most popular routes from London to Philadelphia?

    When deciding which route to take from London to Philadelphia consider London Heathrow - Philadelphia, London Gatwick - Philadelphia or London City - Philadelphia as they are the most popular.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from London to Philadelphia on time: Aer Lingus (75%), American Airlines (73%), Finnair (73%).

  • What are the cheapest flights from London to Philadelphia?

    While on average a flight from London to Philadelphia is generally $1,719, our data shows the cheapest flight currently is $682. When looking at the most popular route, (London Heathrow - Philadelphia), you can expect to pay $553 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London 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 to Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from London to Philadelphia (average of $236). Flying from London to Philadelphia in March is currently the most expensive (average of $295). 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

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Vineland
Wildwood
King of Prussia
Pottstown
Cherry Hill
Ocean City
Chester
Millville
Reading
Ephrata
Camden
Dewey Beach
Dover
Elkton
Essington
Willow Grove
Newark
Exton
Glen Mills
Springfield

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
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Newcastle upon Tyne to John F Kennedy Intl flights
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Southend to John F Kennedy Intl flights

Top 5 airlines flying from London to Philadelphia

Discover the top 5 airlines that operate flights from London 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 2,558,603 searches. Data last updated July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$559Average$800FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$596Average$762FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$600Average$793FlexibilityNo cancel feeOn-time70%
FinnairCheapest$648Average$767FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$670Average$1,223FlexibilityNo cancel feeOn-timeN/A

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