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$160+ 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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Cheap flight deals from Islip to Philadelphia

Cheapest flights from Islip to Philadelphia
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 March 10, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/8. 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.
Fri 5/2910:03 am
ISP
-
PHL
1 stop7h 04m
Multiple Airlines
Sun 5/318:01 pm
PHL
-
ISP
1 stop13h 07m
Multiple Airlines
Deal found 3/8$281
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/95:30 am
ISP
-
PHL
2 stops24h 01m
Frontier
Thu 4/1610:38 pm
PHL
-
ISP
1 stop10h 35m
Frontier
Deal found 3/10$296
This Kiwi.com deal was found by Cheapflights users on 3/8. 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.
Tue 7/1410:03 am
ISP
-
PHL
1 stop10h 47m
Multiple Airlines
Fri 7/178:00 am
PHL
-
ISP
1 stop5h 28m
Multiple Airlines
Deal found 3/8$431
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 3/1111:50 am
ISP
-
PHL
1 stop21h 43m
Multiple Airlines
Tue 3/1710:08 pm
PHL
-
ISP
2 stops13h 02m
Multiple Airlines
Deal found 3/10$450
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 3/97:20 pm
ISP
-
PHL
1 stop18h 36m
Multiple Airlines
Tue 3/107:19 pm
PHL
-
ISP
2 stops15h 51m
Multiple Airlines
Deal found 3/6$476
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/61:07 pm
ISP
-
PHL
1 stop23h 46m
Multiple Airlines
Mon 4/135:35 am
PHL
-
ISP
1 stop7h 56m
Multiple Airlines
Deal found 3/7$508
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 7/187:30 am
ISP
-
PHL
1 stop10h 22m
Frontier
Sun 7/198:01 pm
PHL
-
ISP
1 stop13h 07m
Frontier
Deal found 3/8$512
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 3/1411:50 am
ISP
-
PHL
1 stop21h 43m
Multiple Airlines
Sun 3/153:05 pm
PHL
-
ISP
1 stop18h 58m
Multiple Airlines
Deal found 3/8$518

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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$281
(Kiwi.com)

One-way from

$160
(Kiwi.com)
Provider with most accurate pricing for Islip Long Island-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-Philadelphia flights.
Search Deals
From Islip Long Island to Philadelphia
Search Deals
One-way flight from Islip Long Island to Philadelphia
Search Deals

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 March 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

Price

Cheapest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 4/9

5:30 am-5:31 am

2 stops24h 01m

Philadelphia

Thu 4/16

10:38 pm-9:13 am

1 stop10h 35m

$296

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 5/29

10:03 am-5:07 pm

1 stop7h 04m

Philadelphia

Sun 5/31

8:01 pm-1:28 pm

2 stops17h 27m

$334

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 7/14

10:03 am-8:50 pm

1 stop10h 47m

Philadelphia

Fri 7/17

8:00 am-1:28 pm

1 stop5h 28m

$431

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 4/6

1:07 pm-12:53 pm

1 stop23h 46m

Philadelphia

Mon 4/13

5:35 am-1:31 pm

1 stop7h 56m

$508

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 7/18

7:30 am-5:52 pm

1 stop10h 22m

Philadelphia

Sun 7/19

8:01 pm-9:08 am

1 stop13h 07m

$512

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 3/24

11:59 am-1:56 pm

1 stop25h 57m

Philadelphia

Sat 3/28

10:12 pm-4:13 pm

1 stop18h 01m

$576
Quickest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 7/14

5:00 pm-11:51 pm

1 stop6h 51m

Philadelphia

Fri 7/17

7:00 am-2:11 pm

1 stop7h 11m

$1,491
Cheapest one-way

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 4/7

6:00 am-5:54 pm

2 stops35h 54m

$160

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 4/7

6:00 am-4:48 pm

3 stops34h 48m

$173

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 5/20

11:57 am-12:54 am

2 stops12h 57m

$192

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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.

  • How long is the flight from Islip, New York to Philadelphia?

    For as low as $296, Frontier can have you in Philadelphia from Islip, New York in 24h 01m. The distance between Islip, New York and Philadelphia is about 129 mi.

  • Can I find deals for flights from Islip to Philadelphia that include hotel bookings?

    Yes. In addition to deals on Islip to Philadelphia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Philadelphia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Philadelphia.

  • Can I find deals for business class flights from Islip to Philadelphia?

    Yes. Cheapflights offers flight deals from Islip to Philadelphia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
Reading
King of Prussia
Camden
Ocean City
Cherry Hill
Lewes
Dewey Beach
Pottstown
Ephrata
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Glen Mills
Chester

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to Philadelphia

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