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$147+ Cheap flights from Philadelphia to Islip, NY (PHL - ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
dic. 31 — ene. 71
mié. 12/31
mié. 1/7
1 adult, Economy
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Cheap 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 diciembre 1, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$147
(Kiwi.com)

Popular in

November

Cheapest in

August

Average price

$487
Provider with most accurate pricing for Philadelphia-Islip Long Island flight deals.
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Provider most trusted by Cheapflights users for Philadelphia-Islip Long Island flights.
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From Philadelphia to Islip Long Island
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Highest demand for flights based on searches. 18% potential increase in price ($81 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Find 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 diciembre 1, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/1510:00 pmPHL - ISP
1 stop21h 34mMultiple Airlines
jue. 12/1812:20 pmISP - PHL
2 stops10h 57mMultiple Airlines
Deal found 11/29$205
This Kiwi.com deal was found by Cheapflights users on 11/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/410:00 pmPHL - ISP
2 stops15h 45mMultiple Airlines
sáb. 12/1310:19 amISP - PHL
1 stop13h 15mMultiple Airlines
Deal found 11/30$338
This Kiwi.com deal was found by Cheapflights users on 11/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/410:00 pmPHL - ISP
1 stop21h 34mFrontier
sáb. 12/1310:19 amISP - PHL
1 stop14h 21mFrontier
Deal found 11/30$381
This Kiwi.com deal was found by Cheapflights users on 11/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/288:41 pmPHL - ISP
2 stops16h 28mFrontier
dom. 1/48:24 pmISP - PHL
1 stop12h 13mFrontier
Deal found 11/30$395
This Kiwi.com deal was found by Cheapflights users on 11/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/36:00 amPHL - ISP
2 stops16h 44mMultiple Airlines
vie. 12/58:29 pmISP - PHL
1 stop13h 31mMultiple Airlines
Deal found 11/29$429
This Kiwi.com deal was found by Cheapflights users on 12/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/56:00 amPHL - ISP
2 stops27h 13mFrontier
dom. 12/711:15 amISP - PHL
1 stop22h 45mFrontier
Deal found 12/1$431
This Kiwi.com deal was found by Cheapflights users on 11/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/288:05 pmPHL - ISP
1 stop17h 40mMultiple Airlines
dom. 1/48:24 pmISP - PHL
1 stop12h 13mMultiple Airlines
Deal found 11/30$442
This Kiwi.com deal was found by Cheapflights users on 11/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/34:00 pmPHL - ISP
1 stop17h 13mFrontier
vie. 12/58:29 pmISP - PHL
1 stop13h 31mFrontier
Deal found 11/29$443
This Kiwi.com deal was found by Cheapflights users on 11/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/306:14 pmPHL - ISP
1 stop13h 48mFrontier
sáb. 12/610:19 amISP - PHL
2 stops14h 22mFrontier
Deal found 11/29$583
This Kiwi.com deal was found by Cheapflights users on 11/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/308:42 pmPHL - ISP
1 stop11h 20mMultiple Airlines
sáb. 12/610:19 amISP - PHL
1 stop13h 15mMultiple Airlines
Deal found 11/29$595

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 diciembre 1, 2025.
Use the filters below to find and compare flights from Philadelphia to Islip that are best for you.

Fly from

Philadelphia

Fly to

Islip

Route

Depart

Return

Price

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 1/22

8:07 pm-6:38 pm

1 stop22h 31m

Islip Long Island

lun. 1/26

7:43 pm-2:44 pm

1 stop19h 01m

$147

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 1/29

8:20 am-6:48 pm

2 stops10h 28m

Islip Long Island

dom. 2/1

7:53 pm-10:26 am

1 stop14h 33m

$182

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

vie. 1/9

6:00 am-1:21 pm

1 stop7h 21m

Islip Long Island

dom. 1/11

8:40 pm-12:33 pm

1 stop15h 53m

$183

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

lun. 12/15

10:00 pm-7:34 pm

1 stop21h 34m

Islip Long Island

jue. 12/18

12:20 pm-11:17 pm

2 stops10h 57m

$205

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 12/4

10:00 pm-1:45 pm

2 stops15h 45m

Islip Long Island

sáb. 12/13

10:19 am-11:34 pm

1 stop13h 15m

$338

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 12/4

10:00 pm-7:34 pm

1 stop21h 34m

Islip Long Island

sáb. 12/13

10:19 am-12:40 am

1 stop14h 21m

$381

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 12/11

5:45 pm-11:59 pm

2 stops30h 14m

$170

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 12/4

10:00 pm-1:45 pm

2 stops15h 45m

$185

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 12/11

10:00 pm-7:34 pm

1 stop21h 34m

$189

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

jue. 12/4

10:00 pm-7:34 pm

1 stop21h 34m

$220

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/1

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Philadelphia-Islip, New York flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Islip

What is the cheapest month to book a flight from Philadelphia to Islip, New York?

Currently, May is the cheapest month in which you can book a flight from Philadelphia to Islip, New York (average of $155). Flying from Philadelphia to Islip, New York in October is currently the most expensive (average of $496). 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.

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 $147, Frontier can have you in Islip, New York from Philadelphia in 22h 31m. 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.

  • What is the cheapest month to book a flight from Philadelphia to Islip, New York?

    Currently, May is the cheapest month in which you can book a flight from Philadelphia to Islip, New York (average of $155). Flying from Philadelphia to Islip, New York in October is currently the most expensive (average of $496). 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 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

See prices for flight routes from nearby airports that may be better suited for you.
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