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$221+ Cheap flights from Philadelphia (PHL) to Heathrow (LHR)

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — LHR
Sep 10 — Sep 171
Wed 9/10
Wed 9/17
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to London Heathrow are usually found in September or October, booked 9 days in advance, depart on a Wednesday or Monday and return on a Tuesday

Cheap flight deals from Philadelphia to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Heathrow (LHR). 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 September 5, 2025.

Round-trip from

$491
(Mytrip)

One-way from

$221
(Mytrip)

Popular in

June

Cheapest in

September

Average price

$687

Good round-trip deal

$577 or less

Good one-way deal

$487 or less
From Philadelphia to London Heathrow
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One-way flight from Philadelphia to London Heathrow
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Highest demand for flights based on searches. 18% potential increase in price ($190 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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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Find flight deals from Philadelphia to Heathrow

Cheapest flights from Philadelphia to Heathrow
Explore the most affordable flight options available from Philadelphia to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 5, 2025.

This Mytrip deal was found by Cheapflights users on 9/3. 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 10/207:30 amPHL - LHR
2 stops21h 05mMultiple Airlines
Tue 11/186:50 amLHR - PHL
2 stops12h 57mMultiple Airlines
Deal found 9/3$491
This American Airlines deal was found by Cheapflights users on 9/4. 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 10/86:30 pmPHL - LHR
Nonstop7h 10mAmerican Airlines
Fri 10/249:05 amLHR - PHL
1 stop12h 45mAmerican Airlines
Deal found 9/4$492
This Mytrip deal was found by Cheapflights users on 9/4. 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 9/297:30 amPHL - LHR
1 stop23h 20mMultiple Airlines
Thu 10/96:50 amLHR - PHL
2 stops12h 48mMultiple Airlines
Deal found 9/4$493
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/308:30 pmPHL - LHR
1 stop9h 40mAer Lingus
Thu 10/91:25 pmLHR - PHL
1 stop10h 35mAer Lingus
Deal found 9/3$494
This Mytrip deal was found by Cheapflights users on 9/4. 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 9/227:30 amPHL - LHR
1 stop18h 05mMultiple Airlines
Thu 10/96:50 amLHR - PHL
2 stops12h 48mMultiple Airlines
Deal found 9/4$495
This American Airlines deal was found by Cheapflights users on 9/3. 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 11/196:35 pmPHL - LHR
Nonstop7h 00mAmerican Airlines
Tue 11/258:25 amLHR - PHL
1 stop12h 15mAmerican Airlines
Deal found 9/3$496
This lol.travel deal was found by Cheapflights users on 9/4. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/146:30 amPHL - LHR
1 stop24h 15mUnited Airlines
Tue 9/234:40 pmLHR - PHL
1 stop21h 53mUnited Airlines
Deal found 9/4$497
This American Airlines deal was found by Cheapflights users on 9/2. 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.
Tue 11/115:49 pmPHL - LHR
1 stop10h 26mAmerican Airlines
Tue 11/187:20 amLHR - PHL
1 stop13h 10mAmerican Airlines
Deal found 9/2$498
This Air Canada deal was found by Cheapflights users on 9/3. 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.
Fri 11/73:30 pmPHL - LHR
2 stops14h 50mMultiple Airlines
Sun 11/96:50 amLHR - PHL
2 stops12h 57mMultiple Airlines
Deal found 9/3$499
This Mytrip deal was found by Cheapflights users on 9/3. 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.
Sat 9/204:50 pmPHL - LHR
1 stop32h 45mMultiple Airlines
Tue 10/76:50 amLHR - PHL
2 stops13h 59mMultiple Airlines
Deal found 9/3$500
This American Airlines deal was found by Cheapflights users on 9/3. 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 10/296:08 pmPHL - LHR
1 stop11h 07mAmerican Airlines
Fri 11/77:30 amLHR - PHL
1 stop13h 10mAmerican Airlines
Deal found 9/3$501
This Gotogate deal was found by Cheapflights users on 9/4. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/199:20 amPHL - LHR
1 stop16h 10mMultiple Airlines
Wed 10/299:00 amLHR - PHL
2 stops19h 15mMultiple Airlines
Deal found 9/4$503

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia to Heathrow 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 September 5, 2025.
Use the filters below to find and compare flights from Philadelphia to London Heathrow Airport that are best for you.

Fly from

Philadelphia

Fly to

Heathrow

Route

Depart

Return

Price

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 11/19

3:30 pm-7:10 am

1 stop10h 40m

London Heathrow

Wed 11/26

1:25 pm-2:08 pm

2 stops29h 43m

$504

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 9/23

3:25 pm-6:30 am

1 stop10h 05m

London Heathrow

Wed 10/1

2:05 pm-2:04 pm

2 stops28h 59m

$504

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 11/3

8:00 pm-6:40 am

1 stop29h 40m

London Heathrow

Tue 11/11

1:25 pm-2:47 pm

1 stop30h 22m

$508

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 10/21

7:58 pm-6:55 am

1 stop29h 57m

London Heathrow

Wed 10/29

1:25 pm-2:47 pm

1 stop29h 22m

$508

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 9/24

6:30 am-11:45 am

1 stop24h 15m

London Heathrow

Wed 10/1

2:05 pm-2:38 pm

1 stop29h 33m

$510

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sat 9/27

5:01 pm-6:20 am

1 stop32h 19m

London Heathrow

Wed 10/8

2:05 pm-2:38 pm

1 stop29h 33m

$510

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 11/18

8:00 pm-6:40 am

1 stop29h 40m

London Heathrow

Tue 11/25

1:25 pm-2:47 pm

1 stop30h 22m

$510

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 10/20

7:58 pm-6:55 am

1 stop29h 57m

London Heathrow

Tue 11/18

1:25 pm-2:47 pm

1 stop30h 22m

$510

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 9/30

6:30 am-11:45 am

1 stop24h 15m

London Heathrow

Wed 10/8

2:05 pm-2:38 pm

1 stop29h 33m

$510

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 9/29

6:30 am-11:45 am

1 stop24h 15m

London Heathrow

Wed 10/8

2:05 pm-2:38 pm

1 stop29h 33m

$510

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/3

Showing 1-10 of 18 results
1
2

The best insider tips for Philadelphia to London Heathrow Airport 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 Philadelphia to London Heathrow Airport trip
Airports
PHL

For convenient parking, choose facilities across from your terminal. Long-term and economy lots are cheaper, accessible via free shuttle.

Read more about PHLby Mark Chesnut
LHR

Take the Heathrow Express for the fastest trip to central London, arriving at Paddington Station for easy onward travel.

Read more about LHRby Ramsey Qubein
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 Philadelphia to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Philadelphia 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 Philadelphia to London Heathrow Airport

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

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Heathrow. Price data was last updated on August 29, 2025.

Booking 9 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, November is the cheapest month in which you can book a flight from Philadelphia to London Heathrow Airport (average of $661). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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?

Find hourly flight availability from Philadelphia to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 5, 2025.

A simple way to save on the total cost of your ticket is to fly from Philadelphia to London Heathrow Airport at noon. If you’re flexible enough to do this you can expect to save up to 10% on your trip compared to booking a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from Philadelphia to Heathrow. Price data was last updated on December 16, 2024.

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

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated September 5, 2025.
Peruse reviews from past customers who have flown with Finnair, American Airlines, and Aer Lingus from Philadelphia to London Heathrow Airport 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.
Finnair
7.6
Good
1,321 reviews

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Overall

7.6

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Daniel,May 2025

HEL - ARN

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.
Finnair
7.6
Good
1,321 reviews
Finnair
7.6
Good
1,321 reviews

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Overall

7.6

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Daniel,May 2025

HEL - ARN

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.
American Airlines
7.2
Good
10,000 reviews
Finnair
7.6
Good
1,321 reviews

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Overall

7.6

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Daniel,May 2025

HEL - ARN

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.
Aer Lingus
7.2
Good
1,252 reviews
Finnair
7.6
Good
1,321 reviews

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Overall

7.6

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Daniel,May 2025

HEL - ARN

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.
Iberia
7.0
Good
2,913 reviews
Finnair
7.6
Good
1,321 reviews

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Overall

7.6

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Daniel,May 2025

HEL - ARN

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.
British Airways
6.7
Okay
7,345 reviews
Finnair
7.6
Good
1,321 reviews

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Overall

7.6

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Daniel,May 2025

HEL - ARN

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Heathrow. 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 from for flights from Philadelphia to London Heathrow?

    Located just 7.0 mi from the city center, Philadelphia is the airport most travelers will use when flying to London Heathrow from Philadelphia. Booking flights from Philadelphia (PHL) to London Heathrow should be relatively easy as there are 14 daily outbound flights to London Heathrow from 7 different airlines.

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

    United Airlines can get you from Philadelphia to London Heathrow Airport in just under 10h 40m. Your travel time can differ by up to . Philadelphia and London Heathrow Airport are separated by a distance of 3533 mi.

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

    According to our current data, JetBlue ($504), British Airways ($510), and American Airlines ($516) offers the cheapest pricing from Philadelphia to London Heathrow Airport. You may be able to fly from Philadelphia to London Heathrow Airport for 38% less than the average price by searching for these airlines.

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

    Consider Aer Lingus (78%), American Airlines (67%) or Finnair (67%) 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?

    Looking for the cheapest flight from Philadelphia to London Heathrow Airport? While on average our users pay $1,894, our data indicates the cheapest price to be $414. The most popular route (Philadelphia - London Heathrow), is priced around $471.

  • 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 vacation 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, November is the cheapest month in which you can book a flight from Philadelphia to London Heathrow Airport (average of $661). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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 Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Stratford-upon-Avon
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Chelmsford
Bedford

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Philadelphia to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
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LaGuardia to Heathrow flights
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LaGuardia to Stansted flights
Pittsburgh to Gatwick flights
Philadelphia to Luton flights
Pittsburgh to London City flights
LaGuardia to Luton flights
Pittsburgh to Stansted flights
John F Kennedy Intl to Southend flights
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Newark to Southend flights
Pittsburgh to Luton flights
Harrisburg to Heathrow flights
Reagan-National to Luton flights
Allentown to Heathrow flights
Harrisburg to London City flights
State College to Heathrow flights
Scranton to Heathrow flights
Scranton to Gatwick flights
Dulles Intl to Southend flights
Allentown to London City flights
Elmira to Heathrow flights
Allentown to Gatwick flights

Top 7 airlines flying from Philadelphia to Heathrow

Discover the top 7 airlines that operate flights from Philadelphia to Heathrow. 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 September 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$504Average$656FlexibilityNo cancel feeOn-time62%
British AirwaysCheapest$510Average$762FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$516Average$848FlexibilityNo cancel feeOn-time71%
FinnairCheapest$562Average$779FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$583Average$809FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$603Average$776FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$673Average$936FlexibilityNo cancel feeOn-time69%

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