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$525+ 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 6/27. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PHL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 Wednesday 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 June 12, 2025.

Round-trip from

$611
(ChecknFly)

One-way from

$525
(Mytrip)

Popular in

August

Cheapest in

February

Average price

$759

Good round-trip deal

$692 or less

Good one-way deal

$597 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. 9% potential increase in price ($82 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This ChecknFly deal was found by Cheapflights users on 6/10. 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.
Fri 8/297:55 amLHR - PHL
1 stop11h 10mFinnair
Thu 9/116:30 pmPHL - LHR
Nonstop7h 10mFinnair
Deal found 6/10$611
This Norse deal was found by Cheapflights users on 6/11. 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 7/310:00 amLGW - PHL
1 stop32h 40mMultiple Airlines
Mon 7/1411:16 amPHL - LGW
1 stop14h 39mMultiple Airlines
Deal found 6/11$614
This Expedia deal was found by Cheapflights users on 6/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/248:15 pmLHR - PHL
1 stop25h 00mBritish Airways
Tue 9/235:14 pmPHL - LHR
1 stop9h 36mBritish Airways
Deal found 6/10$615
This Netflights deal was found by Cheapflights users on 6/11. 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 11/126:50 amLCY - PHL
1 stop12h 05mBritish Airways
Wed 11/199:10 pmPHL - LCY
1 stop19h 30mBritish Airways
Deal found 6/11$617
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/38:00 amLHR - PHL
1 stop12h 50mAmerican Airlines
Mon 9/157:50 pmPHL - LHR
Nonstop7h 15mAmerican Airlines
Deal found 6/10$621
This JetBlue deal was found by Cheapflights users on 6/10. 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.
Tue 9/28:25 amLHR - PHL
1 stop14h 25mJetBlue
Sat 9/203:10 pmPHL - LHR
1 stop10h 20mJetBlue
Deal found 6/10$623
This Lufthansa deal was found by Cheapflights users on 6/12. 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.
Mon 9/18:30 amLHR - PHL
1 stop12h 30mMultiple Airlines
Sun 9/143:25 pmPHL - LHR
1 stop10h 05mMultiple Airlines
Deal found 6/12$628
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/36:30 amLHR - PHL
2 stops20h 01mDelta
Sun 9/217:59 pmPHL - LHR
1 stop31h 56mDelta
Deal found 6/10$630
This ChecknFly deal was found by Cheapflights users on 6/10. 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.
Tue 7/82:30 pmLGW - PHL
1 stop29h 03mFinnair
Tue 7/152:04 pmPHL - LGW
1 stop15h 36mFinnair
Deal found 6/10$636
This Bravofly deal was found by Cheapflights users on 6/10. 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/239:40 amLHR - PHL
1 stop12h 09mVirgin Atlantic
Mon 6/306:33 pmPHL - LHR
1 stop13h 57mVirgin Atlantic
Deal found 6/10$639
This Air Canada deal was found by Cheapflights users on 6/11. 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.
Wed 11/129:25 amLCY - PHL
2 stops34h 25mMultiple Airlines
Wed 11/193:30 pmPHL - LCY
2 stops36h 15mMultiple Airlines
Deal found 6/11$649
This Travelis deal was found by Cheapflights users on 6/9. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2310:05 amLHR - PHL
Nonstop7h 55mIberia
Mon 6/3010:15 pmPHL - LHR
Nonstop7h 05mIberia
Deal found 6/9$649

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 June 12, 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 8/29

7:55 am-2:05 pm

1 stop11h 10m

Philadelphia

Thu 9/11

6:30 pm-6:40 am

Nonstop7h 10m

$611

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Thu 7/3

10:00 am-1:40 pm

1 stop32h 40m

Philadelphia

Mon 7/14

11:16 am-6:55 am

1 stop14h 39m

$614

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sun 8/24

8:15 pm-4:15 pm

1 stop25h 00m

Philadelphia

Tue 9/23

5:14 pm-7:50 am

1 stop9h 36m

$615

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 9/3

8:00 am-3:50 pm

1 stop12h 50m

Philadelphia

Mon 9/15

7:50 pm-8:05 am

Nonstop7h 15m

$621

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Tue 9/2

8:25 am-5:50 pm

1 stop14h 25m

Philadelphia

Sun 9/21

3:10 pm-6:30 am

1 stop10h 20m

$623

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 9/1

8:30 am-4:00 pm

1 stop12h 30m

Philadelphia

Sun 9/14

3:25 pm-6:30 am

1 stop10h 05m

$628

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 9/3

8:40 am-9:31 pm

2 stops17h 51m

Philadelphia

Wed 9/17

1:15 pm-6:45 am

1 stop12h 30m

$630

LondonPhiladelphia

LGW - PHL

LGWPHL

London Gatwick

Tue 7/8

2:30 pm-2:33 pm

1 stop29h 03m

Philadelphia

Tue 7/15

2:04 pm-10:40 am

1 stop15h 36m

$636

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 6/23

9:40 am-4:49 pm

1 stop12h 09m

Philadelphia

Mon 6/30

6:33 pm-1:30 pm

1 stop13h 57m

$639

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 6/23

10:05 am-1:00 pm

Nonstop7h 55m

Philadelphia

Mon 6/30

10:15 pm-10:20 am

Nonstop7h 05m

$649

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 56 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 June 9, 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 June 12, 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 16% versus a flight in the morning.

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 June 12, 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).

Rainfall in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

Temperature in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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 June 12, 2025.
Peruse reviews from past customers who have flown with Delta, KLM and Austrian Airlines from London to Philadelphia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
802 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,290 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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, Finnair ($611), British Airways ($615), and American Airlines ($621) offers the cheapest pricing from London to Philadelphia. You may be able to fly from London to Philadelphia for 18% 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 ($545), British Airways ($641), and Iberia ($647).

  • 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 (89%), American Airlines (81%), Finnair (81%).

  • What are the cheapest flights from London to Philadelphia?

    While on average a flight from London to Philadelphia is generally $2,181, our data shows the cheapest flight currently is $513. When looking at the most popular route, (London Heathrow - Philadelphia), you can expect to pay $525 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 London?

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

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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.
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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$559Average$800FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$592Average$780FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$596Average$779FlexibilityNo cancel feeOn-time71%
FinnairCheapest$648Average$767FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$670Average$1,223FlexibilityNo cancel feeOn-timeN/A

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