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Pennsylvania

$113+ Cheap flights from Islip (ISP) to Pennsylvania

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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Islip to Pennsylvania

Keep the following information in mind while searching for Islip to Pennsylvania flight deals. Data was last updated September 11, 2025.

Round-trip from

$158
(Frontier)

One-way from

$113
(Trip.com)

Popular in

July

Cheapest in

September

Average price

$169
From Islip Long Island to Pennsylvania
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One-way flight from Islip Long Island to Pennsylvania
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Highest demand for flights based on searches. 20% potential increase in price ($93 potential increase over avg. RT price).
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Cheapest flight prices on average. 9% potential price decrease ($32 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 Islip to Pennsylvania

Cheapest flights from Islip to Pennsylvania
Explore the most affordable flight options available from Islip to Pennsylvania. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Frontier deal was found by Cheapflights users on 9/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3011:25 amISP - PHL
1 stop9h 46mFrontier
Tue 10/711:34 amPHL - ISP
1 stop9h 08mFrontier
Deal found 9/8$158
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/255:12 pmISP - PHL
1 stop7h 47mFrontier
Mon 9/2910:16 pmPHL - ISP
1 stop12h 24mFrontier
Deal found 9/10$161
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/84:58 pmISP - PHL
1 stop14h 32mFrontier
Wed 10/159:14 pmPHL - ISP
1 stop23h 28mFrontier
Deal found 9/10$179
This Booking.com deal was found by Cheapflights users on 9/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2511:40 amISP - PIT
1 stop21h 09mFrontier
Sun 9/2810:24 amPIT - ISP
1 stop24h 16mFrontier
Deal found 9/11$192
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Thu 10/99:37 pmISP - PIT
1 stop23h 04mMultiple Airlines
Thu 10/169:46 pmPIT - ISP
1 stop12h 51mMultiple Airlines
Deal found 9/9$233
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Tue 10/79:37 pmISP - LGA
1 stop11h 23mMultiple Airlines
Tue 10/145:55 amLGA - ISP
1 stop14h 47mMultiple Airlines
Deal found 9/9$234
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 12/38:09 pmISP - PHL
1 stop11h 20mMultiple Airlines
Wed 12/1010:46 amPHL - ISP
1 stop8h 28mMultiple Airlines
Deal found 9/10$239
This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/79:37 pmISP - JFK
1 stop12h 47mFrontier
Tue 10/146:59 amJFK - ISP
1 stop13h 43mFrontier
Deal found 9/9$244
This Frontier deal was found by Cheapflights users on 9/11. 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 10/211:40 amISP - PHL
1 stop13h 12mFrontier
Thu 10/911:16 amPHL - ISP
1 stop9h 26mFrontier
Deal found 9/11$252
This Frontier deal was found by Cheapflights users on 9/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1011:22 amISP - PHL
1 stop6h 10mFrontier
Sun 10/1211:45 amPHL - ISP
1 stop9h 07mFrontier
Deal found 9/9$262
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Sat 10/411:40 amISP - PHL
2 stops12h 07mMultiple Airlines
Wed 10/89:14 pmPHL - ISP
1 stop23h 28mMultiple Airlines
Deal found 9/9$277
This Southwest deal was found by Cheapflights users on 9/11. 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.
Wed 10/221:10 pmISP - DCA
1 stop9h 45mSouthwest
Sat 10/252:30 pmDCA - ISP
1 stop5h 40mSouthwest
Deal found 9/11$277

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Pennsylvania 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 11, 2025.
Use the filters below to find and compare flights from Islip to Pennsylvania that are best for you.

Fly from

Islip

Fly to

Pennsylvania

Route

Depart

Return

Price

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 9/30

11:25 am-9:11 pm

1 stop9h 46m

Philadelphia

Tue 10/7

11:34 am-8:42 pm

1 stop9h 08m

$158

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/25

5:12 pm-12:59 am

1 stop7h 47m

Philadelphia

Mon 9/29

10:16 pm-10:40 am

1 stop12h 24m

$161

IslipPittsburgh

ISP - PIT

ISPPIT

Islip Long Island

Thu 9/25

11:40 am-8:49 am

1 stop21h 09m

Pittsburgh

Sun 9/28

10:24 am-10:40 am

1 stop24h 16m

$192

IslipPittsburgh

ISP - PIT

ISPPIT

Islip Long Island

Thu 10/9

9:37 pm-8:41 pm

1 stop23h 04m

Pittsburgh

Thu 10/16

9:46 pm-10:37 am

1 stop12h 51m

$233

IslipNew York

ISP - LGA

ISPLGA

Islip Long Island

Tue 10/7

9:37 pm-9:00 am

1 stop11h 23m

New York LaGuardia

Tue 10/14

5:55 am-8:42 pm

1 stop14h 47m

$234

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 12/3

8:09 pm-7:29 am

1 stop11h 20m

Philadelphia

Wed 12/10

10:46 am-7:14 pm

1 stop8h 28m

$239

IslipNew York

ISP - JFK

ISPJFK

Islip Long Island

Tue 10/7

9:37 pm-10:24 am

1 stop12h 47m

New York John F Kennedy Intl

Tue 10/14

6:59 am-8:42 pm

1 stop13h 43m

$244

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 10/8

4:58 pm-11:26 am

1 stop18h 28m

Philadelphia

Wed 10/15

5:53 pm-9:04 am

2 stops15h 11m

$248

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 10/2

11:40 am-12:52 am

1 stop13h 12m

Philadelphia

Thu 10/9

11:16 am-8:42 pm

1 stop9h 26m

$252

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 10/10

11:22 am-5:32 pm

1 stop6h 10m

Philadelphia

Sun 10/12

11:45 am-8:52 pm

1 stop9h 07m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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

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

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

Currently, August is the cheapest month in which you can book a flight from Islip to Pennsylvania (average of $236). Flying from Islip to Pennsylvania in March is currently the most expensive (average of $295). 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 ISP to PA?

Find hourly flight availability from Islip to Pennsylvania. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

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

Reviews of airlines servicing Pennsylvania

Get insights into the airlines that provide service to Pennsylvania. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Pennsylvania. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with Southwest from Islip to Pennsylvania by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Islip to Pennsylvania. 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 from for flights from Islip to Pennsylvania?

    Located just 7.2 mi from the city center, Islip Long Island (ISP) is the airport most travelers will use when flying to Pennsylvania from Islip.

  • How long is the flight from Islip to Pennsylvania?

    Airlines like Frontier, Southwest, and JetBlue fly from Islip to Pennsylvania in about 6h 31m. The time it takes to get you to your destination can typically vary by up to 3h 15m. Islip and Pennsylvania are separated by a distance of 248 mi. This flight may include one or multiple stops.

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

    When deciding which route to take from Islip to Pennsylvania consider Islip Long Island - Philadelphia, Islip Long Island - Washington, D.C. Reagan-National or Islip Long Island - Pittsburgh as they are the most popular.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Islip to Pennsylvania (average of $236). Flying from Islip to Pennsylvania in March is currently the most expensive (average of $295). 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

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Alternative routes for Islip to Pennsylvania

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Islip to Pennsylvania

Discover the top airline that operate flights from Islip to Pennsylvania. 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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$183Average$438FlexibilityNo cancel feeOn-time63%

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