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$273+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — LHR
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Find cheap flights from Philadelphia to Heathrow with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Philadelphia to London Heathrow are usually found in September or October, booked 78 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap 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 March 10, 2026.

This CheapOair deal was found by Cheapflights users on 3/6. 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.
Fri 8/212:27 pm
PHL
-
LHR
2 stops37h 53m
Scandinavian Airlines
Mon 8/246:40 am
LHR
-
PHL
2 stops20h 57m
Scandinavian Airlines
Deal found 3/6$680
This CrystalTravel deal was found by Cheapflights users on 3/5. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:40 am
PHL
-
LHR
2 stops18h 40m
Scandinavian Airlines
Wed 10/216:40 am
LHR
-
PHL
2 stops20h 58m
Scandinavian Airlines
Deal found 3/5$688
This FlightHub deal was found by Cheapflights users on 3/7. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/89:40 am
PHL
-
LHR
2 stops27h 50m
Scandinavian Airlines
Tue 9/156:40 am
LHR
-
PHL
2 stops18h 18m
Scandinavian Airlines
Deal found 3/7$703
This CrystalTravel deal was found by Cheapflights users on 3/5. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/269:40 am
PHL
-
LHR
2 stops18h 40m
Scandinavian Airlines
Wed 9/26:40 am
LHR
-
PHL
2 stops18h 18m
Scandinavian Airlines
Deal found 3/5$716
This Cheapflightsfares deal was found by Cheapflights users on 3/5. 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.
Sat 3/76:00 am
PHL
-
LHR
1 stop19h 55m
JetBlue
Sat 3/149:20 am
LHR
-
PHL
1 stop17h 11m
JetBlue
Deal found 3/5$722
This KAYAK deal was found by Cheapflights users on 3/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/199:54 am
PHL
-
LHR
1 stop17h 01m
JetBlue
Mon 3/308:40 am
LHR
-
PHL
1 stop15h 44m
JetBlue
Deal found 3/9$723
This Scandinavian Airlines deal was found by Cheapflights users on 3/5. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/89:40 am
PHL
-
LHR
2 stops27h 50m
Scandinavian Airlines
Tue 9/226:40 am
LHR
-
PHL
2 stops18h 18m
Scandinavian Airlines
Deal found 3/5$725
This Cheapflightsfares deal was found by Cheapflights users on 3/5. 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.
Tue 4/215:40 pm
PHL
-
LHR
1 stop14h 00m
Lufthansa
Tue 4/289:30 am
LHR
-
PHL
1 stop11h 35m
Lufthansa
Deal found 3/5$728
This Finnair deal was found by Cheapflights users on 3/5. 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.
Tue 4/217:35 pm
PHL
-
LHR
Nonstop7h 15m
Multiple Airlines
Wed 4/298:15 am
LHR
-
PHL
1 stop11h 50m
Multiple Airlines
Deal found 3/5$732
This FlightHub deal was found by Cheapflights users on 3/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/269:40 am
PHL
-
LHR
2 stops18h 40m
Scandinavian Airlines
Tue 9/15:00 pm
LHR
-
PHL
2 stops31h 58m
Scandinavian Airlines
Deal found 3/9$733

Find 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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$680
(CheapOair)

One-way from

$273
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$781

Good round-trip deal

$733 or less

Good one-way deal

$432 or less
Provider with most accurate pricing for Philadelphia-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-London Heathrow flights.
Search Deals
From Philadelphia to London Heathrow
Search Deals
One-way flight from Philadelphia to London Heathrow
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($171 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Philadelphia to London Heathrow.
Search Deals
Price to beat on a one-way flight from Philadelphia to London Heathrow.
Search Deals

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 March 10, 2026.
Use the filters below to find and compare flights from Philadelphia to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 4/28

6:45 pm-6:50 am

Nonstop7h 05m

London Heathrow

Thu 5/7

12:30 pm-3:30 pm

Nonstop8h 00m

$768

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 4/29

5:32 pm-12:05 pm

2 stops13h 33m

London Heathrow

Wed 5/6

6:30 am-5:50 pm

2 stops16h 20m

$808
Quickest round-trip

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 4/28

6:45 pm-6:50 am

Nonstop7h 05m

London Heathrow

Mon 5/4

9:15 am-12:10 pm

Nonstop7h 55m

$818

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 4/15

5:32 pm-12:05 pm

2 stops13h 33m

London Heathrow

Sun 4/19

11:45 am-10:12 pm

2 stops15h 27m

$858

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 5/8

9:26 am-6:45 am

1 stop16h 19m

London Heathrow

Fri 5/22

11:30 am-11:07 pm

2 stops16h 37m

$861

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Thu 4/30

6:40 pm-6:50 am

Nonstop7h 10m

London Heathrow

Fri 5/8

1:45 pm-4:40 pm

Nonstop7h 55m

$868

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 4/22

6:33 pm-5:45 pm

3 stops18h 12m

London Heathrow

Wed 4/29

6:00 am-9:40 pm

2 stops20h 40m

$873

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sat 3/28

7:25 am-8:35 am

1 stop21h 10m

London Heathrow

Sat 4/4

9:30 am-12:59 am

2 stops44h 29m

$916

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Tue 4/28

6:33 pm-6:50 pm

2 stops19h 17m

London Heathrow

Mon 5/4

11:20 am-7:35 am

3 stops25h 15m

$919

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 3/27

4:35 pm-8:35 pm

2 stops24h 00m

London Heathrow

Mon 4/6

2:05 pm-2:46 pm

1 stop29h 41m

$929

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Philadelphia to Heathrow

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Heathrow in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Philadelphia-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-London Heathrow Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 March 6, 2026.

Booking 78 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 $392). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of $578). 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 March 10, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to London Heathrow Airport as you normally would.

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

The best insider tips for Philadelphia to London Heathrow Airport flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to London Heathrow Airport trip
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

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

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

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 March 10, 2026.
Peruse reviews from past customers who have flown with Finnair,Aer Lingus, andAmerican Airlines 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
1,371 reviews

Overall

7.6

Crew

8.2

Boarding

7.7

Food

6.7

Comfort

7.5

Entertainment

6.9

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
1,371 reviews
Finnair
7.6
Good
1,371 reviews

Overall

7.6

Crew

8.2

Boarding

7.7

Food

6.7

Comfort

7.5

Entertainment

6.9

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
1,473 reviews
Finnair
7.6
Good
1,371 reviews

Overall

7.6

Crew

8.2

Boarding

7.7

Food

6.7

Comfort

7.5

Entertainment

6.9

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
7.1
Good
11,414 reviews
Finnair
7.6
Good
1,371 reviews

Overall

7.6

Crew

8.2

Boarding

7.7

Food

6.7

Comfort

7.5

Entertainment

6.9

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
3,133 reviews
Finnair
7.6
Good
1,371 reviews

Overall

7.6

Crew

8.2

Boarding

7.7

Food

6.7

Comfort

7.5

Entertainment

6.9

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
7,781 reviews
Finnair
7.6
Good
1,371 reviews

Overall

7.6

Crew

8.2

Boarding

7.7

Food

6.7

Comfort

7.5

Entertainment

6.9

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

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

    Finnair and Delta can get you from Philadelphia to London Heathrow Airport in just under 7h 05m. Your travel time can differ by up to 6h 28m. Philadelphia and London Heathrow Airport are separated by a distance of 3533 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, British Airways ($505), Finnair ($514), and American Airlines ($515) offers the cheapest pricing from Philadelphia to London Heathrow Airport. You may be able to fly from Philadelphia to London Heathrow Airport for 39% 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 JetBlue, with whom users have recently found tickets for as low as $174. However, be on the lookout for offers from TAP AIR PORTUGAL and Iberia, 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 (75%), American Airlines (74%) or Finnair (74%) 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 $1,783, our data indicates the cheapest price to be $306. The most popular route (Philadelphia - London Heathrow), is priced around $680.

  • 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 $392). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of $578). 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
Ilford
Hounslow
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Orpington
Watford
Northampton
Borehamwood
Broadway
Aylesbury
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$505Average$744FlexibilityNo cancel feeOn-time70%
FinnairCheapest$514Average$784FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$515Average$836FlexibilityNo cancel feeOn-time71%
Aer LingusCheapest$522Average$780FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$560Average$1,276FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$589Average$676FlexibilityNo cancel feeOn-time62%
IberiaCheapest$592Average$806FlexibilityNo cancel feeOn-time77%

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