$240+ 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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Oct 16 — Oct 231
Round-trip
1 adult, Economy
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Find cheap flights from Philadelphia to Islip with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Philadelphia to Islip
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Cheapest flights from Philadelphia to IslipExplore 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 September 16, 2026.
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 September 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/149:30 am -
1 stop24h 47m
Tue 10/2012:00 pm -
1 stop25h 29m
Deal found 9/13![Multiple Airlines logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/139:30 am -
1 stop25h 50m
Tue 10/2012:00 pm -
1 stop25h 29m
Deal found 9/13![Multiple Airlines logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Mon 10/127:20 pm -
1 stop16h 00m
Tue 10/2012:00 pm -
2 stops30h 15m
Deal found 9/13![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 9/299:30 am -
1 stop25h 50m
Thu 10/15:43 pm -
1 stop17h 57m
Deal found 9/14![Multiple Airlines logo]()
$386
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am -
1 stop12h 03m
Mon 10/55:43 pm -
1 stop6h 26m
Deal found 9/10![Frontier logo]()
$387
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Mon 9/285:32 pm -
2 stops17h 48m
Fri 10/25:43 pm -
1 stop17h 57m
Deal found 9/12![Multiple Airlines logo]()
$412
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/155:15 am -
1 stop12h 15m
Sun 10/186:25 pm -
1 stop17h 08m
Deal found 9/14![Frontier logo]()
$426
Best flights from Philadelphia to IslipDiscover carefully curated flight deals from Philadelphia to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2026.
Discover carefully curated flight deals from Philadelphia to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Mon 10/127:20 pm -
1 stop16h 00m
Tue 10/2012:00 pm -
2 stops30h 15m
Deal found 9/13![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/155:15 am -
1 stop12h 15m
Sun 10/186:25 pm -
1 stop17h 08m
Deal found 9/14![Frontier logo]()
$426
This Southwest deal was found by Cheapflights users on 9/13. 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 10/137:00 am -
2 stops8h 30m
Tue 10/206:05 am -
2 stops9h 20m
Deal found 9/13![Southwest logo]()
$428
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/139:30 am -
1 stop25h 50m
Tue 10/2012:00 pm -
2 stops30h 15m
Deal found 9/13![Multiple Airlines logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 9/299:30 am -
1 stop25h 50m
Thu 10/15:43 pm -
1 stop17h 57m
Deal found 9/14![Multiple Airlines logo]()
$386
This Southwest deal was found by Cheapflights users on 9/14. 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 10/152:35 pm -
1 stop8h 40m
Sun 10/185:40 am -
2 stops8h 25m
Deal found 9/14![Southwest logo]()
$438
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:15 am -
1 stop11h 43m
Mon 10/55:43 pm -
1 stop6h 26m
Deal found 9/14![Frontier logo]()
$497
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/16:00 am -
2 stops10h 48m
Sat 10/312:00 pm -
1 stop4h 27m
Deal found 9/14![Multiple Airlines logo]()
$429
This Southwest deal was found by Cheapflights users on 9/14. 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 10/13:20 pm -
2 stops8h 15m
Sat 10/312:20 pm -
2 stops8h 35m
Deal found 9/14![Southwest logo]()
$499
This Southwest deal was found by Cheapflights users on 9/12. 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.
Mon 9/288:00 am -
2 stops8h 25m
Fri 10/23:10 pm -
2 stops8h 40m
Deal found 9/12![Southwest logo]()
$503
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Sun 9/278:00 am -
1 stop27h 12m
Thu 10/15:43 pm -
1 stop30h 26m
Deal found 9/11![Multiple Airlines logo]()
$478
Last-minute flights from Philadelphia to IslipDiscover last-minute flight deals from Philadelphia to Islip. Data last updated September 16, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Islip. Data last updated September 16, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Mon 9/285:32 pm -
2 stops17h 48m
Fri 10/25:43 pm -
1 stop17h 57m
Deal found 9/12![Multiple Airlines logo]()
$412
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 9/299:30 am -
1 stop25h 50m
Thu 10/15:43 pm -
1 stop17h 57m
Deal found 9/14![Multiple Airlines logo]()
$386
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am -
1 stop12h 03m
Mon 10/55:43 pm -
1 stop6h 26m
Deal found 9/10![Frontier logo]()
$387
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Mon 10/127:20 pm -
1 stop16h 00m
Tue 10/2012:00 pm -
2 stops30h 15m
Deal found 9/13![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/139:30 am -
1 stop25h 50m
Tue 10/2012:00 pm -
1 stop25h 29m
Deal found 9/13![Multiple Airlines logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/149:30 am -
1 stop24h 47m
Tue 10/2012:00 pm -
1 stop25h 29m
Deal found 9/13![Multiple Airlines logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/155:15 am -
1 stop12h 15m
Sun 10/186:25 pm -
1 stop17h 08m
Deal found 9/14![Frontier logo]()
$426
One-way flights from Philadelphia to IslipSearch for one-way flight options from Philadelphia to Islip. Find affordable one-way fares based on user searches. Data last updated September 16, 2026.
Search for one-way flight options from Philadelphia to Islip. Find affordable one-way fares based on user searches. Data last updated September 16, 2026.
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/225:15 am -
1 stop12h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 9/237:59 pm -
2 stops22h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Multiple Airlines logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 9/237:59 pm -
1 stop22h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Frontier logo]()
$315
This Frontier deal was found by Cheapflights users on 9/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2210:37 am -
1 stop6h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Frontier logo]()
$328
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 September 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $266 (Kiwi.com) |
One-way from | $240 (Frontier) |
Popular in | February |
Cheapest in | March |
Average price | $262 |
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 7,457,451 searches. Data last updated September 16, 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
Cheapest round-trip
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Thu 10/22
5:15 am-5:30 pm
1 stop12h 15m
Islip Long Island
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$240
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Wed 9/23
7:59 pm-6:03 pm
1 stop22h 04m
Islip Long Island
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$315
Quickest round-trip
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Tue 9/22
10:37 am-4:58 pm
1 stop6h 21m
Islip Long Island
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$328
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Mon 10/12
7:20 pm-11:20 am
1 stop16h 00m
Islip Long Island
Tue 10/20
12:00 pm-6:15 pm
2 stops30h 15m
$337
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Wed 9/23
12:25 pm-7:05 pm
3 stops30h 40m
Islip Long Island
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$338
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Tue 10/13
9:30 am-11:20 am
1 stop25h 50m
Islip Long Island
Tue 10/20
12:00 pm-6:15 pm
2 stops30h 15m
$350
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Tue 9/29
9:30 am-11:20 am
1 stop25h 50m
Islip Long Island
Thu 10/1
5:43 pm-11:40 am
1 stop17h 57m
$386
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Thu 10/15
5:15 am-5:30 pm
1 stop12h 15m
Islip Long Island
Sun 10/18
6:25 pm-11:33 am
1 stop17h 08m
$426
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Tue 10/13
7:00 am-3:30 pm
2 stops8h 30m
Islip Long Island
Tue 10/20
6:05 am-3:25 pm
2 stops9h 20m
$428
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Thu 10/1
6:00 am-4:48 pm
2 stops10h 48m
Islip Long Island
Sat 10/3
12:00 pm-4:27 pm
1 stop4h 27m
$429
Showing 1-10 of 15 resultsSorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
PHL-ISP
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.
Traveling to a place near Islip?
Book flights to Islip if you plan to visit one of these locationsRiverhead
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