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$391+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — LHR
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to London Heathrow are usually found in October or January, booked 56 days in advance, depart on a Wednesday or Tuesday 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 July 1, 2025.

Round-trip from

$627
(United Airlines)

One-way from

$391
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$998

Good round-trip deal

$700 or less

Good one-way deal

$508 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 ($192 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 July 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 July 1, 2025.

This United Airlines deal was found by Cheapflights users on 7/1. 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.
Mon 11/108:00 pmPHL - LHR
1 stop29h 40mUnited Airlines
Tue 11/181:25 pmLHR - PHL
1 stop30h 22mUnited Airlines
Deal found 7/1$627
This Lufthansa deal was found by Cheapflights users on 7/1. 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.
Wed 11/123:30 pmPHL - LHR
1 stop10h 40mLufthansa
Tue 11/187:30 amLHR - PHL
1 stop13h 35mLufthansa
Deal found 7/1$628
This Booking.com deal was found by Cheapflights users on 6/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:20 amPHL - LHR
1 stop19h 15mAir Canada
Wed 10/86:50 amLHR - PHL
2 stops12h 48mAir Canada
Deal found 6/30$629
This Booking.com deal was found by Cheapflights users on 6/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/178:30 pmPHL - LHR
1 stop11h 10mAer Lingus
Fri 9/269:50 amLHR - PHL
1 stop14h 10mAer Lingus
Deal found 6/30$631
This Cheapflightsfares deal was found by Cheapflights users on 6/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/73:35 pmPHL - LHR
1 stop10h 25mBritish Airways
Thu 11/136:30 amLHR - PHL
1 stop12h 25mBritish Airways
Deal found 6/30$636
This Delta deal was found by Cheapflights users on 6/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/206:45 amPHL - LHR
1 stop25h 45mDelta
Thu 9/46:15 amLHR - PHL
2 stops20h 16mDelta
Deal found 6/30$646
This CheapOair deal was found by Cheapflights users on 6/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/299:20 amPHL - LHR
1 stop19h 15mMultiple Airlines
Mon 10/131:30 pmLHR - PHL
1 stop31h 30mMultiple Airlines
Deal found 6/30$647
This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1510:15 pmPHL - LHR
Nonstop7h 05mAmerican Airlines
Tue 9/237:45 amLHR - PHL
1 stop13h 10mAmerican Airlines
Deal found 6/30$648
This Iberia deal was found by Cheapflights users on 7/1. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/169:15 pmPHL - LHR
1 stop29h 05mIberia
Fri 8/2912:30 pmLHR - PHL
Nonstop8h 05mIberia
Deal found 7/1$655
This Finnair deal was found by Cheapflights users on 6/30. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/157:50 pmPHL - LHR
Nonstop7h 15mFinnair
Mon 9/229:35 pmLHR - PHL
1 stop21h 20mFinnair
Deal found 6/30$658
This JetBlue deal was found by Cheapflights users on 6/29. 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.
Sun 8/2410:15 amPHL - LHR
1 stop15h 15mJetBlue
Sun 9/78:25 amLHR - PHL
1 stop17h 59mJetBlue
Deal found 6/29$674

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 July 1, 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

Mon 11/10

8:00 pm-6:40 am

1 stop29h 40m

London Heathrow

Wed 11/19

1:25 pm-2:47 pm

1 stop30h 22m

$627

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 11/12

3:30 pm-7:10 am

1 stop10h 40m

London Heathrow

Tue 11/18

7:30 am-4:05 pm

1 stop13h 35m

$628

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 10/1

9:20 am-9:35 am

1 stop19h 15m

London Heathrow

Wed 10/8

6:50 am-2:38 pm

2 stops12h 48m

$629

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 9/17

8:30 pm-12:40 pm

1 stop11h 10m

London Heathrow

Fri 9/26

9:50 am-7:00 pm

1 stop14h 10m

$631

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 11/7

3:35 pm-7:00 am

1 stop10h 25m

London Heathrow

Thu 11/13

6:30 am-1:55 pm

1 stop12h 25m

$636

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 8/20

5:22 pm-10:30 am

1 stop12h 08m

London Heathrow

Wed 8/27

6:15 am-6:04 pm

2 stops16h 49m

$646

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 9/29

9:20 am-9:35 am

1 stop19h 15m

London Heathrow

Mon 10/13

1:30 pm-4:00 pm

1 stop31h 30m

$647

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 9/15

10:15 pm-10:20 am

Nonstop7h 05m

London Heathrow

Tue 9/23

7:45 am-3:55 pm

1 stop13h 10m

$648

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sat 8/16

9:15 pm-7:20 am

1 stop29h 05m

London Heathrow

Fri 8/29

12:30 pm-3:35 pm

Nonstop8h 05m

$655

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 9/15

7:50 pm-8:05 am

Nonstop7h 15m

London Heathrow

Mon 9/22

9:35 pm-1:55 pm

1 stop21h 20m

$658

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 22 results
1
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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 June 27, 2025.

Booking 56 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 $1,098). 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 July 1, 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.

Weekly flight availability from Philadelphia to London Heathrow Airport

Explore weekly flight availability from Philadelphia to Heathrow. 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 1, 2025.

The most flights from PHL to LHR are scheduled on a Monday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).

How much does it cost to fly round-trip from Philadelphia to London Heathrow Airport?

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 July 1, 2025.
Peruse reviews from past customers who have flown with Delta, Finnair, and SWISS 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.
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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
7,973 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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
1,301 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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
1,654 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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!
United Airlines
7.4
Good
8,858 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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!
JetBlue
7.3
Good
2,919 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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 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 11 daily outbound flights to London Heathrow from 7 different airlines.

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

    According to our current data, United Airlines ($627), Lufthansa ($628), and Air Canada ($629) offers the cheapest pricing from Philadelphia to London Heathrow Airport. You may be able to fly from Philadelphia to London Heathrow Airport for 25% less than the average price by searching for these airlines.

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

    The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as $394. However, be on the lookout for offers from United Airlines and Aer Lingus, as they are both options that can get you from Philadelphia to London Heathrow Airport for a low price.

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

    Consider Aer Lingus (87%), American Airlines (86%) or Finnair (86%) 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 $1,954, our data indicates the cheapest price to be $455. The most popular route (Philadelphia - London Heathrow), is priced around $584.

  • 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 $1,098). 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
Hayes
Hounslow
Thornton Heath
Canterbury
Harrow
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Folkestone
Borehamwood
Broadway
Aylesbury
Chelmsford
Brentwood
Chichester
Swindon

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.
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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 July 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$547Average$662FlexibilityNo cancel feeOn-time62%
Aer LingusCheapest$579Average$807FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$610Average$779FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$617Average$812FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$631Average$866FlexibilityNo cancel feeOn-time71%
FinnairCheapest$636Average$792FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$673Average$936FlexibilityNo cancel feeOn-time69%

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