$128+ 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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Oct 8 — Oct 151
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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 8, 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 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:30 am -
1 stop24h 47m
Wed 10/712:00 pm -
2 stops21h 32m
Deal found 9/6![Multiple Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:15 am -
1 stop9h 43m
Wed 10/75:43 pm -
1 stop17h 50m
Deal found 9/6![Frontier logo]()
$361
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:32 pm -
1 stop17h 48m
Tue 9/1512:00 pm -
1 stop25h 35m
Deal found 9/7![Multiple Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/187:19 pm -
1 stop16h 01m
Tue 9/225:43 pm -
1 stop15h 47m
Deal found 9/3![Multiple Airlines logo]()
$371
This Southwest deal was found by Cheapflights users on 9/3. 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.
Fri 10/233:20 pm -
2 stops8h 20m
Sun 10/256:15 pm -
1 stop6h 45m
Deal found 9/3![Southwest logo]()
$382
This Frontier deal was found by Cheapflights users on 9/3. 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 9/3![Frontier logo]()
$384
This Frontier deal was found by Cheapflights users on 9/3. 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.
Fri 9/2510:10 am -
1 stop6h 48m
Thu 10/15:43 pm -
1 stop24h 48m
Deal found 9/3![Frontier logo]()
$407
This Frontier deal was found by Cheapflights users on 9/4. 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.
Sat 9/2610:10 am -
1 stop6h 48m
Sat 10/35:43 pm -
1 stop6h 26m
Deal found 9/4![Frontier logo]()
$456
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 8, 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 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:30 am -
1 stop24h 47m
Wed 10/712:00 pm -
2 stops21h 32m
Deal found 9/6![Multiple Airlines logo]()
$349
This Frontier deal was found by Cheapflights users on 9/3. 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 9/3![Frontier logo]()
$384
This Southwest deal was found by Cheapflights users on 9/3. 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.
Fri 10/233:20 pm -
2 stops8h 20m
Sun 10/255:40 am -
2 stops7h 50m
Deal found 9/3![Southwest logo]()
$453
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/237:42 am -
1 stop6h 40m
Sun 10/256:25 pm -
1 stop15h 07m
Deal found 9/3![Multiple Airlines logo]()
$361
This Frontier deal was found by Cheapflights users on 9/3. 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.
Fri 9/2510:10 am -
1 stop6h 48m
Thu 10/15:43 pm -
1 stop24h 48m
Deal found 9/3![Frontier logo]()
$407
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/187:19 pm -
1 stop16h 01m
Tue 9/225:43 pm -
1 stop15h 47m
Deal found 9/3![Multiple Airlines logo]()
$371
This Frontier deal was found by Cheapflights users on 9/4. 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.
Sat 9/2610:10 am -
1 stop6h 48m
Sat 10/35:43 pm -
1 stop6h 26m
Deal found 9/4![Frontier logo]()
$456
This Southwest deal was found by Cheapflights users on 9/3. 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.
Fri 9/182:05 pm -
2 stops8h 05m
Tue 9/2212:55 pm -
2 stops8h 05m
Deal found 9/3![Southwest logo]()
$522
This Frontier deal was found by Cheapflights users on 9/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/276:00 pm -
1 stop24h 03m
Sat 10/35:43 pm -
1 stop6h 26m
Deal found 9/6![Frontier logo]()
$523
Last-minute flights from Philadelphia to IslipDiscover last-minute flight deals from Philadelphia to Islip. Data last updated September 8, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Islip. Data last updated September 8, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:32 pm -
1 stop17h 48m
Tue 9/1512:00 pm -
1 stop25h 35m
Deal found 9/7![Multiple Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/187:19 pm -
1 stop16h 01m
Tue 9/225:43 pm -
1 stop15h 47m
Deal found 9/3![Multiple Airlines logo]()
$371
This Frontier deal was found by Cheapflights users on 9/3. 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.
Fri 9/2510:10 am -
1 stop6h 48m
Thu 10/15:43 pm -
1 stop24h 48m
Deal found 9/3![Frontier logo]()
$407
This Frontier deal was found by Cheapflights users on 9/4. 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.
Sat 9/2610:10 am -
1 stop6h 48m
Sat 10/35:43 pm -
1 stop6h 26m
Deal found 9/4![Frontier logo]()
$456
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:30 am -
1 stop24h 47m
Wed 10/712:00 pm -
2 stops21h 32m
Deal found 9/6![Multiple Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:15 am -
1 stop9h 43m
Wed 10/75:43 pm -
1 stop17h 50m
Deal found 9/6![Frontier logo]()
$361
This Frontier deal was found by Cheapflights users on 9/3. 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 9/3![Frontier logo]()
$384
This Southwest deal was found by Cheapflights users on 9/3. 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.
Fri 10/233:20 pm -
2 stops8h 20m
Sun 10/256:15 pm -
1 stop6h 45m
Deal found 9/3![Southwest logo]()
$382
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 8, 2026.
Search for one-way flight options from Philadelphia to Islip. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:22 pm -
2 stops16h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/227:20 pm -
1 stop19h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$192
This Southwest deal was found by Cheapflights users on 9/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/223:20 pm -
2 stops8h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Southwest logo]()
$214
This Frontier deal was found by Cheapflights users on 9/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2310:37 am -
1 stop6h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$283
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 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $349 (Kiwi.com) |
One-way from | $128 (Kiwi.com) |
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 8, 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
7:20 pm-2:22 pm
1 stop19h 02m
Islip Long Island
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$192
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Thu 10/22
3:20 pm-11:40 pm
2 stops8h 20m
Islip Long Island
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$214
Quickest round-trip
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Wed 9/23
10:37 am-4:58 pm
1 stop6h 21m
Islip Long Island
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$283
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Wed 9/30
9:30 am-10:17 am
1 stop24h 47m
Islip Long Island
Wed 10/7
12:00 pm-9:32 am
2 stops21h 32m
$349
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Fri 10/23
7:42 am-2:22 pm
1 stop6h 40m
Islip Long Island
Sun 10/25
6:25 pm-9:32 am
1 stop15h 07m
$361
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Fri 9/18
7:19 pm-11:20 am
1 stop16h 01m
Islip Long Island
Tue 9/22
5:43 pm-9:30 am
1 stop15h 47m
$371
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Thu 10/1
6:00 am-6:03 pm
1 stop12h 03m
Islip Long Island
Mon 10/5
5:43 pm-12:09 am
1 stop6h 26m
$384
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Fri 9/25
10:10 am-4:58 pm
1 stop6h 48m
Islip Long Island
Thu 10/1
5:43 pm-6:31 pm
1 stop24h 48m
$407
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Fri 10/23
3:20 pm-11:40 pm
2 stops8h 20m
Islip Long Island
Sun 10/25
5:40 am-1:30 pm
2 stops7h 50m
$453
PhiladelphiaIslip
PHL Philadelphia - ISP Islip Long Island
PHLISP
Philadelphia
Sat 9/26
10:10 am-4:58 pm
1 stop6h 48m
Islip Long Island
Sat 10/3
5:43 pm-12:09 am
1 stop6h 26m
$456
Showing 1-10 of 12 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.
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Book flights to Islip if you plan to visit one of these locationsRiverhead
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