$259+ 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 12/22. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Nov 21 — Nov 281
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 October 22, 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 October 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 12/1010:57 am -
1 stop12h 29m
Sat 12/126:31 pm -
2 stops15h 46m
Deal found 10/21![Multiple Airlines logo]()
$383
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 11/510:57 am -
1 stop12h 27m
Mon 11/95:14 pm -
2 stops18h 06m
Deal found 10/21![Multiple Airlines logo]()
$413
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Tue 11/312:00 pm -
1 stop25h 29m
Sat 11/77:25 pm -
1 stop14h 52m
Deal found 10/19![Multiple Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 10/21. 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 12/105:05 pm -
1 stop6h 10m
Sat 12/1211:50 am -
1 stop8h 35m
Deal found 10/21![Southwest logo]()
$487
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Mon 11/233:02 pm -
1 stop7h 55m
Wed 11/255:01 am -
2 stops12h 32m
Deal found 10/19![Multiple Airlines logo]()
$572
This Frontier deal was found by Cheapflights users on 10/20. 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 11/126:33 pm -
1 stop14h 57m
Wed 11/185:45 pm -
1 stop23h 46m
Deal found 10/20![Frontier logo]()
$574
This Frontier deal was found by Cheapflights users on 10/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/204:40 pm -
1 stop8h 13m
Wed 2/109:51 pm -
1 stop13h 13m
Deal found 10/19![Frontier logo]()
$587
This Frontier deal was found by Cheapflights users on 10/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:43 pm -
1 stop8h 10m
Wed 2/109:51 pm -
1 stop13h 13m
Deal found 10/19![Frontier logo]()
$596
This FlightHub deal was found by Cheapflights users on 10/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:00 am -
1 stop17h 43m
Wed 11/188:15 am -
1 stop24h 35m
Deal found 10/21![JetBlue logo]()
$597
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 October 22, 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 October 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 12/1010:57 am -
1 stop12h 29m
Sat 12/126:31 pm -
2 stops15h 46m
Deal found 10/21![Multiple Airlines logo]()
$383
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/195:20 pm -
1 stop6h 15m
Mon 3/225:50 am -
1 stop6h 40m
Deal found 10/19![Southwest logo]()
$462
This Frontier deal was found by Cheapflights users on 10/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/204:40 pm -
1 stop8h 13m
Wed 2/109:51 pm -
1 stop13h 13m
Deal found 10/19![Frontier logo]()
$587
This FlightHub deal was found by Cheapflights users on 10/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:00 am -
1 stop17h 43m
Wed 11/188:15 am -
1 stop24h 35m
Deal found 10/18![JetBlue logo]()
$597
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Tue 11/312:00 pm -
1 stop25h 29m
Sat 11/77:25 pm -
1 stop14h 52m
Deal found 10/19![Multiple Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 10/21. 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 12/105:05 pm -
1 stop6h 10m
Sat 12/1211:50 am -
1 stop8h 35m
Deal found 10/21![Southwest logo]()
$487
This Frontier deal was found by Cheapflights users on 10/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:43 pm -
1 stop8h 10m
Sun 2/79:51 pm -
1 stop13h 13m
Deal found 10/19![Frontier logo]()
$625
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Mon 11/233:02 pm -
1 stop7h 55m
Wed 11/255:01 am -
2 stops12h 32m
Deal found 10/19![Multiple Airlines logo]()
$572
Last-minute flights from Islip to PhiladelphiaDiscover last-minute flight deals from Islip to Philadelphia. Data last updated October 22, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to Philadelphia. Data last updated October 22, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Tue 11/312:00 pm -
1 stop25h 29m
Sat 11/77:25 pm -
1 stop14h 52m
Deal found 10/19![Multiple Airlines logo]()
$423
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 11/510:57 am -
1 stop12h 27m
Mon 11/95:14 pm -
2 stops18h 06m
Deal found 10/21![Multiple Airlines logo]()
$413
This FlightHub deal was found by Cheapflights users on 10/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:00 am -
1 stop17h 43m
Wed 11/188:15 am -
1 stop24h 35m
Deal found 10/21![JetBlue logo]()
$597
This Frontier deal was found by Cheapflights users on 10/20. 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 11/126:33 pm -
1 stop14h 57m
Wed 11/185:45 pm -
1 stop23h 46m
Deal found 10/20![Frontier logo]()
$574
This Frontier deal was found by Cheapflights users on 10/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/204:40 pm -
1 stop8h 13m
Wed 2/109:51 pm -
1 stop13h 13m
Deal found 10/19![Frontier logo]()
$587
This Frontier deal was found by Cheapflights users on 10/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:43 pm -
1 stop8h 10m
Wed 2/109:51 pm -
1 stop13h 13m
Deal found 10/19![Frontier logo]()
$596
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Mon 11/233:02 pm -
1 stop7h 55m
Wed 11/255:01 am -
2 stops12h 32m
Deal found 10/19![Multiple Airlines logo]()
$572
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 October 22, 2026.
Search for one-way flight options from Islip to Philadelphia. Find affordable one-way fares based on user searches. Data last updated October 22, 2026.
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/229:25 am -
1 stop7h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Southwest logo]()
$259
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/245:05 pm -
1 stop6h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Southwest logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Thu 12/245:23 pm -
2 stops31h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Multiple Airlines logo]()
$311
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Tue 12/2212:40 pm -
3 stops34h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Multiple Airlines logo]()
$345
This KAYAK deal was found by Cheapflights users on 10/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/116:00 am -
1 stop10h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![JetBlue logo]()
$377
This Frontier deal was found by Cheapflights users on 10/21. 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.
Mon 2/1511:59 am -
1 stop8h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$607
This KAYAK deal was found by Cheapflights users on 10/21. 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 11/56:00 am -
1 stop6h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![JetBlue logo]()
$10,768
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 October 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $383 (Kiwi.com) |
One-way from | $259 (Southwest) |
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 October 22, 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
Tue 12/22
9:25 am-5:20 pm
1 stop7h 55m
Philadelphia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$259
Quickest round-trip
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Thu 12/24
5:05 pm-11:15 pm
1 stop6h 10m
Philadelphia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$285
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Thu 12/24
5:23 pm-12:48 am
2 stops31h 25m
Philadelphia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$311
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Fri 12/11
6:00 am-4:27 pm
1 stop10h 27m
Philadelphia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$377
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Thu 12/10
10:57 am-11:26 pm
1 stop12h 29m
Philadelphia
Sat 12/12
6:31 pm-10:17 am
2 stops15h 46m
$383
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Tue 11/3
12:00 pm-1:29 pm
1 stop25h 29m
Philadelphia
Sat 11/7
7:25 pm-10:17 am
1 stop14h 52m
$423
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Fri 3/19
5:20 pm-11:35 pm
1 stop6h 15m
Philadelphia
Mon 3/22
5:50 am-12:30 pm
1 stop6h 40m
$462
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Thu 12/10
5:05 pm-11:15 pm
1 stop6h 10m
Philadelphia
Sat 12/12
11:50 am-8:25 pm
1 stop8h 35m
$487
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Mon 11/23
3:02 pm-10:57 pm
1 stop7h 55m
Philadelphia
Wed 11/25
5:01 am-5:33 pm
2 stops12h 32m
$572
IslipPhiladelphia
ISP Islip Long Island - PHL Philadelphia
ISPPHL
Islip Long Island
Fri 11/20
4:40 pm-12:53 am
1 stop8h 13m
Philadelphia
Wed 2/10
9:51 pm-11:04 am
1 stop13h 13m
$587
Showing 1-10 of 15 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 October.
| 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
King of Prussia
Reading
Camden
Dover
Ocean City
Wildwood Crest
Cherry Hill
Lewes
Plymouth Meeting
Wyomissing
Pottstown
Milford
Ephrata
Elkton
Essington
New Castle
Willow Grove
Glen Mills
Vineland
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