$202+ Cheap flights from Islip, NY to Philadelphia (ISP - PHL)
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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Oct 9 — Oct 161
Round-trip
1 adult, Economy
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Find cheap flights from Islip to Philadelphia 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 Islip to Philadelphia
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Cheapest flights from Islip to PhiladelphiaExplore 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 September 9, 2026.
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 September 9, 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.
Tue 10/612:00 pm -
1 stop25h 35m
Tue 10/1312:35 pm -
2 stops22h 45m
Deal found 9/6![Multiple Airlines logo]()
$286
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:52 am -
1 stop25h 43m
Wed 9/307:15 am -
1 stop9h 43m
Deal found 9/4![Multiple Airlines logo]()
$327
This Frontier deal was found by Cheapflights users on 9/8. 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 9/295:43 pm -
1 stop6h 26m
Wed 9/3010:37 am -
1 stop6h 21m
Deal found 9/8![Frontier logo]()
$353
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 9/3012:00 pm -
2 stops21h 05m
Sat 10/35:15 am -
1 stop11h 43m
Deal found 9/7![Multiple Airlines logo]()
$363
This Kiwi.com deal was found by Cheapflights users on 9/5. 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 10/45:43 pm -
2 stops37h 33m
Sun 10/117:15 am -
1 stop10h 15m
Deal found 9/5![Frontier logo]()
$373
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 9/85:27 pm -
1 stop20h 08m
Tue 9/159:30 am -
1 stop25h 50m
Deal found 9/7![Multiple Airlines logo]()
$379
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.
Mon 9/215:43 pm -
2 stops29h 35m
Fri 9/257:19 pm -
1 stop16h 01m
Deal found 9/6![Multiple Airlines logo]()
$402
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.
Wed 9/3012:55 pm -
2 stops8h 55m
Sat 10/37:55 am -
2 stops8h 15m
Deal found 9/7![Southwest logo]()
$407
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:05 am -
2 stops9h 20m
Tue 10/137:00 am -
2 stops8h 30m
Deal found 9/6![Southwest logo]()
$409
Best flights from Islip to PhiladelphiaDiscover carefully curated flight deals from Islip to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
Discover carefully curated flight deals from Islip to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:52 am -
1 stop25h 43m
Wed 9/307:15 am -
1 stop9h 43m
Deal found 9/4![Multiple Airlines logo]()
$327
This Frontier deal was found by Cheapflights users on 9/8. 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 9/295:43 pm -
1 stop6h 26m
Wed 9/3010:37 am -
1 stop6h 21m
Deal found 9/8![Frontier logo]()
$353
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.
Wed 9/3012:55 pm -
2 stops8h 55m
Sat 10/37:55 am -
2 stops8h 15m
Deal found 9/7![Southwest logo]()
$407
This Kiwi.com deal was found by Cheapflights users on 9/5. 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 10/45:43 pm -
2 stops37h 33m
Sun 10/117:15 am -
1 stop10h 15m
Deal found 9/5![Frontier logo]()
$373
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:05 am -
2 stops9h 20m
Tue 10/137:00 am -
2 stops8h 30m
Deal found 9/6![Southwest logo]()
$409
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Sat 9/1912:00 pm -
1 stop4h 27m
Sun 9/205:15 am -
1 stop11h 43m
Deal found 9/8![Multiple Airlines logo]()
$445
This Frontier deal was found by Cheapflights users on 9/5. 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 9/265:43 pm -
1 stop6h 26m
Fri 10/23:30 pm -
1 stop25h 28m
Deal found 9/5![Frontier logo]()
$435
This Frontier deal was found by Cheapflights users on 9/8. 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 10/15:43 pm -
1 stop28h 14m
Wed 10/710:37 am -
1 stop6h 21m
Deal found 9/8![Frontier logo]()
$455
Last-minute flights from Islip to PhiladelphiaDiscover last-minute flight deals from Islip to Philadelphia. Data last updated September 9, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to Philadelphia. Data last updated September 9, 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 9/85:27 pm -
1 stop20h 08m
Tue 9/159:30 am -
1 stop25h 50m
Deal found 9/7![Multiple Airlines logo]()
$379
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.
Mon 9/215:43 pm -
2 stops29h 35m
Fri 9/257:19 pm -
1 stop16h 01m
Deal found 9/6![Multiple Airlines logo]()
$402
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:52 am -
1 stop25h 43m
Wed 9/307:15 am -
1 stop9h 43m
Deal found 9/4![Multiple Airlines logo]()
$327
This Frontier deal was found by Cheapflights users on 9/8. 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 9/295:43 pm -
1 stop6h 26m
Wed 9/3010:37 am -
1 stop6h 21m
Deal found 9/8![Frontier logo]()
$353
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 9/3012:00 pm -
2 stops21h 05m
Sat 10/35:15 am -
1 stop11h 43m
Deal found 9/7![Multiple Airlines logo]()
$363
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.
Wed 9/3012:55 pm -
2 stops8h 55m
Sat 10/37:55 am -
2 stops8h 15m
Deal found 9/7![Southwest logo]()
$407
This Kiwi.com deal was found by Cheapflights users on 9/5. 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 10/45:43 pm -
2 stops37h 33m
Sun 10/117:15 am -
1 stop10h 15m
Deal found 9/5![Frontier logo]()
$373
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.
Tue 10/612:00 pm -
1 stop25h 35m
Tue 10/1312:35 pm -
2 stops22h 45m
Deal found 9/6![Multiple Airlines logo]()
$286
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:05 am -
2 stops9h 20m
Tue 10/137:00 am -
2 stops8h 30m
Deal found 9/6![Southwest logo]()
$409
One-way flights from Islip to PhiladelphiaSearch for one-way flight options from Islip to Philadelphia. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
Search for one-way flight options from Islip to Philadelphia. Find affordable one-way fares based on user searches. Data last updated September 9, 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.
Mon 9/215:43 pm -
2 stops29h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$202
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.
Tue 10/65:43 pm -
1 stop6h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$218
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.
Mon 9/2111:52 am -
1 stop25h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Multiple Airlines logo]()
$255
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.
Sat 9/195:43 pm -
1 stop6h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$298
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 9/205:43 pm -
1 stop6h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$327
This KAYAK deal was found by Cheapflights users on 9/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:00 am -
1 stop7h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![JetBlue logo]()
$10,766
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:00 am -
1 stop6h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![JetBlue logo]()
$10,767
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 September 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $286 (Kiwi.com) |
One-way from | $202 (Kiwi.com) |
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 7,457,451 searches. Data last updated September 9, 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
Cheapest round-trip
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Mon 9/21
11:52 am-1:35 pm
1 stop25h 43m
Philadelphia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$255
Quickest round-trip
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Sat 9/19
5:43 pm-12:09 am
1 stop6h 26m
Philadelphia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$298
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Sun 9/20
5:43 pm-12:09 am
1 stop6h 26m
Philadelphia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$327
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Mon 9/28
11:52 am-1:35 pm
1 stop25h 43m
Philadelphia
Wed 9/30
7:15 am-4:58 pm
1 stop9h 43m
$327
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Tue 9/29
5:43 pm-12:09 am
1 stop6h 26m
Philadelphia
Wed 9/30
10:37 am-4:58 pm
1 stop6h 21m
$353
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Sun 10/4
5:43 pm-7:16 am
2 stops37h 33m
Philadelphia
Sun 10/11
7:15 am-5:30 pm
1 stop10h 15m
$373
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Wed 9/30
12:55 pm-9:50 pm
2 stops8h 55m
Philadelphia
Sat 10/3
7:55 am-4:10 pm
2 stops8h 15m
$407
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Tue 10/6
6:05 am-3:25 pm
2 stops9h 20m
Philadelphia
Tue 10/13
7:00 am-3:30 pm
2 stops8h 30m
$409
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Sat 9/26
5:43 pm-12:09 am
1 stop6h 26m
Philadelphia
Fri 10/2
3:30 pm-4:58 pm
1 stop25h 28m
$435
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Sat 9/19
12:00 pm-4:27 pm
1 stop4h 27m
Philadelphia
Sun 9/20
5:15 am-4:58 pm
1 stop11h 43m
$445
Showing 1-10 of 12 resultsSorted by cheapest first
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 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 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.
ISP-PHL
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.
Traveling to a place near Philadelphia?
Book flights to Philadelphia if you plan to visit one of these locationsWildwood
Reading
King of Prussia
Camden
Wildwood Crest
Cherry Hill
Ocean City
Lewes
Plymouth Meeting
Wyomissing
Pottstown
Ephrata
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Vineland
Millville
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