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$229+ Cheap flights from Islip, NY to Philadelphia (ISP - 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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Aug 23 — Aug 301
Sun 8/23
Sun 8/30
1 adult, Economy
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Cheap flight deals from Islip to Philadelphia

Cheapest flights from Islip to Philadelphia
Explore the most affordable flight options available from Islip to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 24, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/21. 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 8/185:27 pm
ISP
-
PHL
2 stops13h 48m
Multiple Airlines
Tue 8/257:25 am
PHL
-
ISP
1 stop9h 22m
Multiple Airlines
Deal found 7/21$279
This Kiwi.com deal was found by Cheapflights users on 7/21. 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.
Thu 9/310:57 am
ISP
-
PHL
1 stop13h 02m
Multiple Airlines
Mon 9/149:14 am
PHL
-
ISP
2 stops26h 06m
Multiple Airlines
Deal found 7/21$286
This Kiwi.com deal was found by Cheapflights users on 7/21. 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.
Thu 9/310:57 am
ISP
-
PHL
1 stop13h 02m
Frontier
Mon 9/145:57 pm
PHL
-
ISP
1 stop15h 36m
Frontier
Deal found 7/21$307
This Kiwi.com deal was found by Cheapflights users on 7/21. 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.
Thu 8/207:49 pm
ISP
-
PHL
2 stops35h 26m
Multiple Airlines
Thu 8/277:20 am
PHL
-
ISP
1 stop10h 54m
Multiple Airlines
Deal found 7/21$317
This Kiwi.com deal was found by Cheapflights users on 7/20. 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.
Fri 9/187:46 pm
ISP
-
PHL
1 stop16h 46m
Multiple Airlines
Tue 9/225:28 pm
PHL
-
ISP
2 stops17h 52m
Multiple Airlines
Deal found 7/20$322
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 8/185:27 pm
ISP
-
PHL
1 stop17h 48m
Multiple Airlines
Mon 8/245:16 pm
PHL
-
ISP
1 stop16h 37m
Multiple Airlines
Deal found 7/21$337
This Southwest deal was found by Cheapflights users on 7/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2010:20 am
ISP
-
PHL
2 stops7h 35m
Southwest
Thu 8/278:00 am
PHL
-
ISP
2 stops8h 25m
Southwest
Deal found 7/21$357
This Southwest deal was found by Cheapflights users on 7/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:05 am
ISP
-
PHL
2 stops8h 15m
Southwest
Mon 8/242:05 pm
PHL
-
ISP
2 stops8h 00m
Southwest
Deal found 7/21$387

Find flight deals from Islip to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) 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 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$279
(Kiwi.com)

One-way from

$229
(Kiwi.com)
Provider with most accurate pricing for Islip Long Island-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-Philadelphia flights.
Search Deals
From Islip Long Island to Philadelphia
Search Deals
One-way flight from Islip Long Island to Philadelphia
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip 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 24, 2026.
Use the filters below to find and compare flights from Islip to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 8/18

5:27 pm-7:15 am

2 stops13h 48m

Philadelphia

Tue 8/25

7:25 am-4:47 pm

1 stop9h 22m

$279

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/3

10:57 am-11:59 pm

1 stop13h 02m

Philadelphia

Mon 9/14

9:14 am-11:20 am

2 stops26h 06m

$286

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 9/18

7:46 pm-12:32 pm

1 stop16h 46m

Philadelphia

Tue 9/22

5:28 pm-11:20 am

2 stops17h 52m

$322
Quickest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 8/18

6:05 am-2:20 pm

2 stops8h 15m

Philadelphia

Mon 8/24

2:05 pm-10:05 pm

2 stops8h 00m

$387

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/3

12:35 pm-9:40 pm

2 stops9h 05m

Philadelphia

Mon 9/14

8:00 am-4:25 pm

2 stops8h 25m

$387

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 8/14

2:28 pm-11:15 am

1 stop20h 47m

Philadelphia

Sun 8/16

9:16 pm-9:53 am

1 stop12h 37m

$429

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 8/7

2:28 pm-11:15 am

1 stop20h 47m

Philadelphia

Tue 8/11

7:20 am-4:47 pm

1 stop9h 27m

$448

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 8/14

10:20 am-5:55 pm

2 stops7h 35m

Philadelphia

Sun 8/16

1:40 pm-10:35 pm

2 stops8h 55m

$484

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/3

4:58 pm-11:53 pm

1 stop6h 55m

Philadelphia

Fri 9/11

1:55 pm-11:22 pm

1 stop9h 27m

$570
Cheapest one-way

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sun 9/6

6:00 am-4:04 pm

1 stop10h 04m

$283

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/19

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

Compare providers for flights from Islip to Philadelphia

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 Islip to Philadelphia in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 Islip, New York-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-Philadelphia 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 Islip, New York-Philadelphia 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 Islip to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Islip 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.

Related info for your journey

Find useful and relevant information for your journey from Islip to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Islip, New York to Philadelphia?

    For as low as $387, Southwest can have you in Philadelphia from Islip, New York in 8h 15m. The distance between Islip, New York and Philadelphia is about 129 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip 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.

See more FAQs

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
King of Prussia
Reading
Camden
Ocean City
Cherry Hill
Lewes
Plymouth Meeting
Wyomissing
Wildwood Crest
Pottstown
Ephrata
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Vineland

Browse thousands of different options on Cheapflights for your next trip

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