$122+ Cheap flights from Islip, NY to Philadelphia (ISP - PHL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/16. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
May 10 — May 171
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 April 10, 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 April 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 4/278:31 pm
ISP
- PHL
1 stop15h 20m
Frontier
Wed 4/297:56 pm
PHL
- ISP
1 stop13h 37m
Frontier
Deal found 4/7![Frontier logo]()
$235
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:59 pm
ISP
- PHL
1 stop20h 13m
Frontier
Fri 5/151:49 pm
PHL
- ISP
2 stops20h 16m
Frontier
Deal found 4/10![Frontier logo]()
$254
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 5/55:38 pm
ISP
- PHL
1 stop15h 21m
Multiple Airlines
Tue 5/129:20 am
PHL
- ISP
1 stop7h 27m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 4/274:07 pm
ISP
- PHL
2 stops17h 42m
Multiple Airlines
Wed 4/297:56 pm
PHL
- ISP
1 stop13h 37m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$272
This Kiwi.com deal was found by Cheapflights users on 4/8. 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.
Wed 4/2211:50 am
ISP
- PHL
2 stops19h 51m
Multiple Airlines
Sun 4/265:05 am
PHL
- ISP
1 stop28h 23m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 4/6. 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.
Fri 4/178:31 pm
ISP
- PHL
1 stop16h 21m
Frontier
Sun 4/197:15 pm
PHL
- ISP
2 stops13h 58m
Frontier
Deal found 4/6![Frontier logo]()
$293
This Trip.com deal was found by Cheapflights users on 4/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/511:00 am
ISP
- PHL
1 stop12h 29m
Frontier
Sun 6/74:35 pm
PHL
- ISP
2 stops17h 30m
Frontier
Deal found 4/5![Frontier logo]()
$319
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 April 10, 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 April 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 4/278:31 pm
ISP
- PHL
1 stop15h 20m
Frontier
Wed 4/297:56 pm
PHL
- ISP
1 stop13h 37m
Frontier
Deal found 4/7![Frontier logo]()
$235
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 5/55:38 pm
ISP
- PHL
1 stop15h 21m
Multiple Airlines
Tue 5/129:20 am
PHL
- ISP
1 stop7h 27m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:59 pm
ISP
- PHL
1 stop20h 13m
Frontier
Fri 5/151:49 pm
PHL
- ISP
2 stops20h 16m
Frontier
Deal found 4/10![Frontier logo]()
$254
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 4/274:07 pm
ISP
- PHL
2 stops17h 42m
Multiple Airlines
Wed 4/297:56 pm
PHL
- ISP
1 stop13h 37m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$272
This Kiwi.com deal was found by Cheapflights users on 4/8. 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.
Wed 4/2211:50 am
ISP
- PHL
2 stops19h 51m
Multiple Airlines
Sun 4/265:05 am
PHL
- ISP
1 stop28h 23m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$284
This Trip.com deal was found by Cheapflights users on 4/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/511:00 am
ISP
- PHL
1 stop12h 29m
Frontier
Sun 6/74:35 pm
PHL
- ISP
2 stops17h 30m
Frontier
Deal found 4/5![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 5/2911:00 am
ISP
- PHL
2 stops13h 44m
Multiple Airlines
Sun 5/314:24 pm
PHL
- ISP
1 stop27h 27m
Multiple Airlines
Deal found 4/9![Multiple Airlines logo]()
$365
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2111:12 am
ISP
- PHL
1 stop13h 28m
Multiple Airlines
Mon 5/252:31 pm
PHL
- ISP
1 stop26h 16m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$381
Last-minute flights from Islip to PhiladelphiaDiscover last-minute flight deals from Islip to Philadelphia. Data last updated April 10, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to Philadelphia. Data last updated April 10, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/6. 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.
Fri 4/178:31 pm
ISP
- PHL
1 stop16h 21m
Frontier
Sun 4/197:15 pm
PHL
- ISP
2 stops13h 58m
Frontier
Deal found 4/6![Frontier logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 4/8. 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.
Wed 4/2211:50 am
ISP
- PHL
2 stops19h 51m
Multiple Airlines
Sun 4/265:05 am
PHL
- ISP
1 stop28h 23m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 4/278:31 pm
ISP
- PHL
1 stop15h 20m
Frontier
Wed 4/297:56 pm
PHL
- ISP
1 stop13h 37m
Frontier
Deal found 4/7![Frontier logo]()
$235
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 4/274:07 pm
ISP
- PHL
2 stops17h 42m
Multiple Airlines
Wed 4/297:56 pm
PHL
- ISP
1 stop13h 37m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$272
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 5/55:38 pm
ISP
- PHL
1 stop15h 21m
Multiple Airlines
Tue 5/129:20 am
PHL
- ISP
1 stop7h 27m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:59 pm
ISP
- PHL
1 stop20h 13m
Frontier
Fri 5/151:49 pm
PHL
- ISP
2 stops20h 16m
Frontier
Deal found 4/10![Frontier logo]()
$254
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 April 10, 2026.
Search for one-way flight options from Islip to Philadelphia. Find affordable one-way fares based on user searches. Data last updated April 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/164:41 pm
ISP
- PHL
1 stop27h 20m
Frontier
Deal found 4/10![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/164:41 pm
ISP
- PHL
2 stops32h 03m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/1410:48 am
ISP
- PHL
1 stop22h 03m
Frontier
Deal found 4/10![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/1410:48 am
ISP
- PHL
2 stops28h 46m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$200
This KAYAK deal was found by Cheapflights users on 4/9. 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.
Tue 6/212:25 pm
ISP
- PHL
1 stop10h 22m
JetBlue
Deal found 4/9![JetBlue logo]()
$235
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:49 pm
ISP
- PHL
3 stops30h 05m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$268
This KAYAK deal was found by Cheapflights users on 4/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/193:07 pm
ISP
- PHL
1 stop8h 44m
JetBlue
Deal found 4/10![JetBlue logo]()
$300
This Expedia deal was found by Cheapflights users on 4/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/212:30 pm
ISP
- PHL
1 stop5h 43m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$362
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 April 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $235 (Kiwi.com) |
One-way from | $122 (Kiwi.com) |
Popular in | October |
Cheapest in | January |
Average price | $519 |
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 2,558,603 searches. Data last updated April 10, 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 - PHL
ISPPHL
Islip Long Island
Mon 4/27
8:31 pm-11:51 am
1 stop15h 20m
Philadelphia
Wed 4/29
7:56 pm-9:33 am
1 stop13h 37m
$235
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Fri 5/8
6:59 pm-3:12 pm
1 stop20h 13m
Philadelphia
Fri 5/15
1:49 pm-10:05 am
2 stops20h 16m
$254
Quickest round-trip
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Tue 5/5
5:38 pm-8:59 am
1 stop15h 21m
Philadelphia
Tue 5/12
9:20 am-4:47 pm
1 stop7h 27m
$263
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Mon 4/27
4:07 pm-9:49 am
2 stops17h 42m
Philadelphia
Wed 4/29
7:56 pm-9:33 am
1 stop13h 37m
$272
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Wed 4/22
11:50 am-7:41 am
2 stops19h 51m
Philadelphia
Sun 4/26
5:05 am-9:28 am
1 stop28h 23m
$284
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Fri 6/5
11:00 am-11:29 pm
1 stop12h 29m
Philadelphia
Sun 6/7
4:35 pm-10:05 am
2 stops17h 30m
$319
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Fri 5/29
11:00 am-12:44 am
2 stops13h 44m
Philadelphia
Sun 5/31
4:24 pm-7:51 pm
1 stop27h 27m
$365
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Thu 5/21
11:12 am-12:40 am
1 stop13h 28m
Philadelphia
Mon 5/25
2:31 pm-4:47 pm
1 stop26h 16m
$381
Cheapest one-way
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Sun 6/14
10:48 am-3:34 pm
2 stops28h 46m
$200
IslipPhiladelphia
ISP - PHL
ISPPHL
Islip Long Island
Tue 6/16
5:27 pm-3:07 pm
3 stops21h 40m
$205
Showing 1-10 of 14 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 April.
| 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
Ocean City
Lewes
Dewey Beach
Pottstown
Ephrata
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Glen Mills
Chester
Newark
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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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