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Islip

$115+ Cheap flights from Philadelphia to Islip, NY (PHL - ISP)

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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Apr 18 — Apr 251
Sat 4/18
Sat 4/25
1 adult, Economy
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Cheap flight deals from Philadelphia to Islip

Cheapest flights from Philadelphia to Islip
Explore the most affordable flight options available from Philadelphia to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 19, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/18. 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 5/219:16 pm
PHL
-
ISP
1 stop12h 49m
Frontier
Tue 8/1810:03 am
ISP
-
PHL
1 stop14h 41m
Frontier
Deal found 3/18$388
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 5/219:16 pm
PHL
-
ISP
1 stop12h 49m
Multiple Airlines
Tue 8/185:27 pm
ISP
-
PHL
2 stops25h 36m
Multiple Airlines
Deal found 3/18$398
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/37:47 pm
PHL
-
ISP
1 stop15h 23m
Multiple Airlines
Tue 4/76:00 am
ISP
-
PHL
2 stops18h 54m
Multiple Airlines
Deal found 3/19$420
This Kiwi.com deal was found by Cheapflights users on 3/17. 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.
Wed 4/15:01 am
PHL
-
ISP
2 stops15h 51m
Multiple Airlines
Sun 4/512:08 pm
ISP
-
PHL
1 stop10h 44m
Multiple Airlines
Deal found 3/17$478
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 3/2712:41 pm
PHL
-
ISP
1 stop22h 29m
Multiple Airlines
Mon 3/302:31 pm
ISP
-
PHL
2 stops29h 27m
Multiple Airlines
Deal found 3/19$484
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/39:18 pm
PHL
-
ISP
1 stop26h 39m
Frontier
Tue 4/75:43 pm
ISP
-
PHL
1 stop18h 59m
Frontier
Deal found 3/19$501
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 3/271:02 pm
PHL
-
ISP
1 stop20h 46m
Multiple Airlines
Sat 3/2811:50 am
ISP
-
PHL
2 stops13h 08m
Multiple Airlines
Deal found 3/19$591
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 5/219:16 pm
PHL
-
ISP
1 stop12h 49m
Multiple Airlines
Sun 5/247:53 pm
ISP
-
PHL
2 stops19h 04m
Multiple Airlines
Deal found 3/15$592
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 3/1711:52 am
PHL
-
ISP
2 stops23h 18m
Multiple Airlines
Tue 3/2411:59 am
ISP
-
PHL
1 stop25h 57m
Multiple Airlines
Deal found 3/16$645

Find flight deals from Philadelphia to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Islip (ISP). 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 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$388
(Kiwi.com)

One-way from

$115
(Kiwi.com)

Popular in

February

Cheapest in

August

Average price

$159
Provider with most accurate pricing for Philadelphia-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Islip Long Island flights.
Search Deals
From Philadelphia to Islip Long Island
Search Deals
One-way flight from Philadelphia to Islip Long Island
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 16% potential price decrease ($49 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia to Islip 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 19, 2026.
Use the filters below to find and compare flights from Philadelphia to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Thu 5/21

9:16 pm-10:05 am

1 stop12h 49m

Islip Long Island

Tue 8/18

10:03 am-12:44 am

1 stop14h 41m

$388

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Thu 5/21

9:16 pm-10:05 am

1 stop12h 49m

Islip Long Island

Tue 8/18

5:27 pm-7:03 pm

2 stops25h 36m

$398

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 4/3

7:47 pm-11:10 am

1 stop15h 23m

Islip Long Island

Tue 4/7

6:00 am-12:54 am

2 stops18h 54m

$420
Quickest round-trip

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Wed 4/1

5:01 am-8:52 pm

2 stops15h 51m

Islip Long Island

Sun 4/5

12:08 pm-10:52 pm

1 stop10h 44m

$478

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 4/3

9:18 pm-11:57 pm

1 stop26h 39m

Islip Long Island

Tue 4/7

5:43 pm-12:42 pm

1 stop18h 59m

$501

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Thu 5/21

9:16 pm-10:05 am

1 stop12h 49m

Islip Long Island

Sun 5/24

7:53 pm-2:57 pm

2 stops19h 04m

$592
Cheapest one-way

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Tue 4/14

8:13 pm-11:10 am

2 stops14h 57m

$115

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Mon 4/13

6:08 pm-11:10 am

2 stops41h 02m

$161
Quickest one-way

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 7/31

7:00 am-2:11 pm

1 stop7h 11m

$387

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 6/19

7:00 am-2:11 pm

1 stop7h 11m

$477

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Showing 1-10 of 11 resultsSorted by cheapest first
1
2

Compare providers for flights from Philadelphia to Islip

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

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

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Islip. 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 Philadelphia to Islip, New York?

    For as low as $388, Frontier can have you in Islip, New York from Philadelphia in 12h 49m. Airlines will cover a distance of 129 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Philadelphia to Islip 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 Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead

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Alternative routes for Philadelphia to Islip

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