In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

What is the cheapest month to fly from Islip, New York to Philadelphia?

The best pricing can be found in the month of September. Prices to Philadelphia from Islip, New York average $316. You can even find prices in September for less than $316, as users have found deals to Philadelphia from as low as $138. The month of April appears to be one of the more expensive times to travel to Philadelphia from Islip, New York. Flying in the targeted month can save you up to 59%.

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

When flying from Islip, New York to Philadelphia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

$109+ Flights from Islip, NY to Philadelphia

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Cheap flight deals from Islip to Philadelphia

Round-trip from	$209 (Expedia)
One-way from	$109 (Expedia)
Popular in	April
Cheapest in	September
Average price	$199

From Islip Long Island to Philadelphia

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One-way flight from Islip Long Island to Philadelphia

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Highest demand for flights based on searches. 17% potential increase in price ($65 potential increase over avg. RT price).

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Cheapest flight prices on average. 5% potential price decrease ($18 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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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 julio 3, 2025.

mar. 7/228:00 amISP - PHL

1 stop6h 18mFrontier

mié. 7/236:37 pmPHL - ISP

1 stop4h 22mFrontier

Deal found 7/2

$209

mar. 7/228:00 amISP - PHL

2 stops15h 30mMultiple Airlines

mié. 7/236:13 amPHL - ISP

1 stop13h 39mMultiple Airlines

Deal found 7/2

$437

dom. 7/612:35 pmISP - PHL

1 stop6h 50mJetBlue

lun. 7/75:40 pmPHL - ISP

2 stops16h 54mJetBlue

Deal found 7/3

$1,457

Best flights from Islip to Philadelphia
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 julio 3, 2025.

mar. 7/228:00 amISP - PHL

1 stop6h 18mFrontier

mié. 7/236:37 pmPHL - ISP

1 stop4h 22mFrontier

Deal found 7/2

$209

mar. 7/228:00 amISP - PHL

2 stops15h 30mMultiple Airlines

mié. 7/236:13 amPHL - ISP

1 stop13h 39mMultiple Airlines

Deal found 7/2

$437

Last-minute flights from Islip to Philadelphia
Discover last-minute flight deals from Islip to Philadelphia. Data last updated julio 3, 2025 and is based on user searches.

dom. 7/612:35 pmISP - PHL

1 stop6h 50mJetBlue

lun. 7/75:40 pmPHL - ISP

2 stops16h 54mJetBlue

Deal found 7/3

$1,457

mar. 7/228:00 amISP - PHL

1 stop6h 18mFrontier

mié. 7/236:37 pmPHL - ISP

1 stop4h 22mFrontier

Deal found 7/2

$209

mar. 7/228:00 amISP - PHL

2 stops15h 30mMultiple Airlines

mié. 7/236:13 amPHL - ISP

1 stop13h 39mMultiple Airlines

Deal found 7/2

$437

One-way flights from Islip to Philadelphia
Search for one-way flight options from Islip to Philadelphia. Find affordable one-way fares based on user searches. Data last updated julio 3, 2025.

sáb. 9/611:40 amISP - PHL

1 stop6h 05mFrontier

Deal found 7/1

$109

lun. 9/82:25 pmISP - PHL

2 stops22h 28mMultiple Airlines

Deal found 7/1

$301

Cheapflights Fare Finder

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

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

mar. 7/22

8:00 am-2:18 pm

1 stop6h 18m

Philadelphia

mié. 7/23

6:37 pm-10:59 pm

1 stop4h 22m

$209

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

mar. 7/22

8:00 am-11:30 pm

2 stops15h 30m

Philadelphia

mié. 7/23

6:13 am-7:52 pm

1 stop13h 39m

$437

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

sáb. 9/6

11:40 am-5:45 pm

1 stop6h 05m

$109

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

lun. 9/8

2:25 pm-12:53 pm

2 stops22h 28m

$301

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

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, New York to Philadelphia?

Currently, August is the cheapest month in which you can book a flight from Islip, New York to Philadelphia (average of $236). Flying from Islip, New York to Philadelphia 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.

Reviews of airlines servicing Philadelphia

Read reviews from past customers who have flown Frontier from Islip to Philadelphia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Frontier

5.9

Fair

3,286 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Jun 2025

TTN - TPA

TTN is a small airport for Frontier. Drop off is easy as is parking. The location is remote so there is zero traffic. The place could use a renovation but for the price you pay it is not necessary. Good-Staff is very friendly. Flight left on time. Bad- run down, deplaning/boarding on the tarmac. I got wet on the stairs outside of the plane while waiting to board.

Frontier

5.9

Fair

3,286 reviews

Frontier

5.9

Fair

3,286 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Jun 2025

TTN - TPA

Related info for your journey

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, New York to Philadelphia?
Currently, August is the cheapest month in which you can book a flight from Islip, New York to Philadelphia (average of $236). Flying from Islip, New York to Philadelphia 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.

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$109+ 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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Philadelphia with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to Philadelphia

Round-trip from

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Average price

Find flight deals from Islip to Philadelphia

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 julio 3, 2025.

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 julio 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Islip to Philadelphia that are best for you.

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.

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, New York to Philadelphia?

Reviews of airlines servicing Philadelphia

Read reviews from past customers who have flown Frontier from Islip to Philadelphia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

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

How can I find direct flights from Islip to Philadelphia?

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

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

Traveling to a place near Islip?

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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 julio 3, 2025.