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Islip

$83+ Cheap flights from Pennsylvania to Islip (ISP)

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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Pennsylvania to Islip

Keep the following information in mind while searching for Pennsylvania to Islip flight deals. Data was last updated September 16, 2025.

Round-trip from

$158
(Frontier)

One-way from

$83
(Frontier)

Popular in

November

Cheapest in

August

Average price

$263
From Pennsylvania to Islip Long Island
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One-way flight from Pennsylvania to Islip Long Island
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Highest demand for flights based on searches. 20% potential increase in price ($94 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Pennsylvania to Islip

Cheapest flights from Pennsylvania to Islip
Explore the most affordable flight options available from Pennsylvania to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Frontier deal was found by Cheapflights users on 9/14. 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 9/2910:16 pmPHL - ISP
1 stop12h 24mFrontier
Fri 10/35:05 pmISP - PHL
1 stop7h 47mFrontier
Deal found 9/14$158
This Southwest deal was found by Cheapflights users on 9/15. 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 11/135:55 pmPIT - ISP
1 stop5h 55mSouthwest
Sat 11/153:40 pmISP - PIT
1 stop5h 55mSouthwest
Deal found 9/15$185
This Frontier deal was found by Cheapflights users on 9/15. 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 9/2210:16 pmPHL - ISP
1 stop12h 24mFrontier
Mon 9/295:05 pmISP - PHL
1 stop7h 47mFrontier
Deal found 9/15$188
This Frontier deal was found by Cheapflights users on 9/15. 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 10/179:53 pmPHL - ISP
1 stop12h 44mFrontier
Mon 10/209:49 amISP - PHL
1 stop12h 50mFrontier
Deal found 9/15$198
This Frontier deal was found by Cheapflights users on 9/14. 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 9/188:59 pmIAD - ISP
1 stop12h 05mFrontier
Fri 9/269:49 amISP - IAD
1 stop10h 20mFrontier
Deal found 9/14$203
This Frontier deal was found by Cheapflights users on 9/14. 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 9/215:01 amPHL - ISP
1 stop11h 26mFrontier
Mon 9/225:05 pmISP - PHL
1 stop7h 47mFrontier
Deal found 9/14$222
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/141:58 pmPHL - ISP
1 stop20h 59mMultiple Airlines
Tue 10/219:37 pmISP - PHL
1 stop15h 16mMultiple Airlines
Deal found 9/16$229
This Trip.com deal was found by Cheapflights users on 9/14. 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 9/267:14 pmIAD - ISP
1 stop15h 41mFrontier
Sun 9/289:49 amISP - IAD
1 stop11h 30mFrontier
Deal found 9/14$232
This Frontier deal was found by Cheapflights users on 9/14. 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 9/221:55 pmIAD - ISP
2 stops20h 45mFrontier
Thu 9/2511:40 amISP - IAD
1 stop6h 44mFrontier
Deal found 9/14$240
This Frontier deal was found by Cheapflights users on 9/14. 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 9/185:01 amPHL - ISP
1 stop11h 26mFrontier
Sat 9/2011:40 amISP - PHL
1 stop7h 57mFrontier
Deal found 9/14$242
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 9/298:43 pmPHL - ISP
1 stop13h 57mMultiple Airlines
Fri 10/35:05 pmISP - PHL
2 stops24h 00mMultiple Airlines
Deal found 9/14$244
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/118:32 amPHL - ISP
1 stop11h 33mMultiple Airlines
Tue 10/149:37 pmISP - PHL
1 stop23h 47mMultiple Airlines
Deal found 9/16$245

Cheapflights Fare Finder

 
Customize your flight search to find flights from Pennsylvania to Islip 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 September 16, 2025.
Use the filters below to find and compare flights from Pennsylvania to Islip that are best for you.

Fly from

Pennsylvania

Fly to

Islip

Route

Depart

Return

Price

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Mon 9/29

10:16 pm-10:40 am

1 stop12h 24m

Islip Long Island

Fri 10/3

5:05 pm-12:52 am

1 stop7h 47m

$158

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Thu 11/13

5:55 pm-11:50 pm

1 stop5h 55m

Islip Long Island

Sat 11/15

3:40 pm-9:35 pm

1 stop5h 55m

$185

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 10/17

9:53 pm-10:37 am

1 stop12h 44m

Islip Long Island

Mon 10/20

9:49 am-10:39 pm

1 stop12h 50m

$198

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Tue 10/14

1:58 pm-10:57 am

1 stop20h 59m

Islip Long Island

Tue 10/21

9:37 pm-12:53 pm

1 stop15h 16m

$229

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 9/26

7:14 pm-10:55 am

1 stop15h 41m

Islip Long Island

Sun 9/28

9:49 am-9:19 pm

1 stop11h 30m

$232

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Mon 9/29

8:43 pm-10:40 am

1 stop13h 57m

Islip Long Island

Fri 10/3

5:05 pm-5:05 pm

2 stops24h 00m

$244

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Sat 10/11

8:32 am-8:05 pm

1 stop11h 33m

Islip Long Island

Tue 10/14

9:37 pm-9:24 pm

1 stop23h 47m

$245

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 10/9

1:07 pm-9:04 am

1 stop19h 57m

Islip Long Island

Mon 10/13

9:49 am-6:45 pm

1 stop8h 56m

$245

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Sat 10/4

12:00 pm-4:15 pm

1 stop4h 15m

Islip Long Island

Sun 10/5

5:25 am-2:30 pm

2 stops9h 05m

$250

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 9/26

10:16 pm-10:55 am

1 stop12h 39m

Islip Long Island

Sun 9/28

9:49 am-6:03 pm

1 stop8h 14m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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Best time to book a flight from Pennsylvania to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Pennsylvania 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 Pennsylvania to Islip

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

Currently, January is the cheapest month in which you can book a flight from Pennsylvania to Islip (average of $108). Flying from Pennsylvania to Islip in November is currently the most expensive (average of $213). 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.

What is the cheapest time of day to fly from PA to ISP?

Find hourly flight availability from Pennsylvania to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pennsylvania to Islip as you normally would.

Related info for your journey

Find useful and relevant information for your journey from Pennsylvania to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Islip from Pennsylvania?

    If you book a flight to Islip from Pennsylvania, you will be flying to Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • How long is the flight from Pennsylvania to Islip?

    A quick flight from Pennsylvania to Islip can take about 5h 55m. Frontier provides one of the quickest options available for as low as $185. There are 375 mi between Pennsylvania and Islip. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Pennsylvania to Islip one-way?

    One-way options have recently been found by users for as low as $93 on Southwest. Other airlines that offer cheap prices include JetBlue from $113 and Breeze Airways from $215 one-way.

  • What are the most popular routes from Pennsylvania to Islip?

    The most popular route from Pennsylvania to Islip is Washington, D.C. Dulles Intl - Islip Long Island. You may also consider Washington, D.C. Reagan-National - Islip Long Island or Pittsburgh - Islip Long Island.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Pennsylvania to Islip 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 Pennsylvania to Islip?

    Currently, January is the cheapest month in which you can book a flight from Pennsylvania to Islip (average of $108). Flying from Pennsylvania to Islip in November is currently the most expensive (average of $213). 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 Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

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Alternative routes for Pennsylvania to Islip

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Top airline flying from Pennsylvania to Islip

Discover the top airline that operate flights from Pennsylvania to Islip. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$219Average$333FlexibilityNo cancel feeOn-time63%

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