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$78+ Cheap flights from Islip 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
1 adult, Economy
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Find 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 October 14, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/13. 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 10/274:58 pmISP - PHL
1 stop21h 19mFrontier
Thu 10/3010:32 pmPHL - ISP
1 stop12h 05mFrontier
Deal found 10/13$288
This Kiwi.com deal was found by Cheapflights users on 10/12. 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 10/286:27 pmISP - PHL
1 stop23h 13mMultiple Airlines
Sat 11/17:38 pmPHL - ISP
2 stops16h 22mMultiple Airlines
Deal found 10/12$295
This Kiwi.com deal was found by Cheapflights users on 10/12. 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 12/248:16 pmISP - PHL
1 stop28h 22mFrontier
Mon 12/295:01 amPHL - ISP
1 stop15h 13mFrontier
Deal found 10/12$500
This Kiwi.com deal was found by Cheapflights users on 10/12. 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 12/248:21 pmISP - PHL
2 stops28h 17mMultiple Airlines
Mon 12/295:01 amPHL - ISP
1 stop15h 13mMultiple Airlines
Deal found 10/12$511
This Kiwi.com deal was found by Cheapflights users on 10/13. 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 10/174:58 pmISP - PHL
1 stop8h 09mMultiple Airlines
Sun 10/1912:10 pmPHL - ISP
1 stop25h 35mMultiple Airlines
Deal found 10/13$542
This Kiwi.com deal was found by Cheapflights users on 10/12. 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 11/2611:03 amISP - PHL
1 stop20h 29mFrontier
Sun 11/306:14 pmPHL - ISP
1 stop13h 48mFrontier
Deal found 10/12$552

Cheap 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 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$288
(Kiwi.com)

One-way from

$78
(Kiwi.com)

Popular in

July

Cheapest in

December

Average price

$484
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
Highest demand for flights based on searches. 12% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 14, 2025.
Use the filters below to find and compare flights from Islip to Philadelphia that are best for you.

Fly from

Islip

Fly to

Philadelphia

Route

Depart

Return

Price

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 10/28

6:27 pm-5:40 pm

1 stop23h 13m

Philadelphia

Sat 11/1

7:38 pm-12:00 pm

2 stops16h 22m

$295

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 10/27

4:58 pm-1:07 am

1 stop8h 09m

Philadelphia

Thu 10/30

12:23 pm-10:37 am

2 stops22h 14m

$327

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 12/24

8:16 pm-12:38 am

1 stop28h 22m

Philadelphia

Mon 12/29

5:01 am-8:14 pm

1 stop15h 13m

$500

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 12/24

8:21 pm-12:38 am

2 stops28h 17m

Philadelphia

Mon 12/29

5:01 am-8:14 pm

1 stop15h 13m

$511

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 10/17

4:58 pm-1:07 am

1 stop8h 09m

Philadelphia

Sun 10/19

12:10 pm-1:45 pm

1 stop25h 35m

$542

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 11/26

11:03 am-7:32 am

1 stop20h 29m

Philadelphia

Sun 11/30

6:14 pm-8:02 am

1 stop13h 48m

$552

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 11/12

4:58 pm-8:35 am

1 stop15h 37m

$78

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 10/24

4:58 pm-1:07 am

1 stop8h 09m

$119

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 11/12

8:21 pm-9:43 pm

3 stops25h 22m

$171

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 10/24

4:58 pm-5:06 pm

2 stops24h 08m

$176

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/13

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.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice 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-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip-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-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.

Cheapflights Insights

Everything you need to know about your flight from Islip to Philadelphia

What is the cheapest month to book a flight from Islip to Philadelphia?

Currently, April is the cheapest month in which you can book a flight from Islip to Philadelphia (average of $114). Flying from Islip to Philadelphia in February is currently the most expensive (average of $331). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 to Philadelphia?

    For as low as $327, Frontier can have you in Philadelphia from Islip in 8h 09m. Airlines will cover a distance of 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.

  • What is the cheapest month to book a flight from Islip to Philadelphia?

    Currently, April is the cheapest month in which you can book a flight from Islip to Philadelphia (average of $114). Flying from Islip to Philadelphia in February is currently the most expensive (average of $331). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
King of Prussia
Pottstown
Reading
Ocean City
Cherry Hill
Dewey Beach
Ephrata
Camden
Vineland
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace
Plymouth Meeting

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