What is the cheapest airline that flies from Islip Long Island to Philadelphia?

Frontier is the most popular carrier operating from Islip Long Island to Philadelphia

When did momondo last update prices for flights from Islip Long Island Airport to Philadelphia Airport?

Prices for flights from Islip Long Island Airport to Philadelphia Airport are updated daily.

How old do you have to be to fly from Islip Long Island Airport to Philadelphia Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Philadelphia Airport.

What documentation or ID do you need to fly to Philadelphia Airport?

The required travel and health documents for your Philadelphia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Philadelphia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$112 Cheap Flights from Islip to Philadelphia in 2026

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Find the cheapest flights from Islip, New York to Philadelphia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:07 pm - 8:02 am

ISP

PHL

14h 55m

1 stop

10:59 pm - 11:10 am

PHL

ISP

36h 11m

2 stops

$208Multiple Airlines

Thu, Feb 19 - Mon, Feb 23

8:00 am - 3:01 pm

ISP

PHL

31h 01m

1 stop

4:09 pm - 11:10 am

PHL

ISP

19h 01m

2 stops

$245Multiple Airlines

Tue, Feb 17 - Tue, Feb 24

8:00 am - 3:01 pm

ISP

PHL

31h 01m

1 stop

6:54 pm - 11:10 am

PHL

ISP

16h 16m

1 stop

$256Multiple Airlines

Tue, Feb 17 - Tue, Feb 24

5:07 pm - 8:02 am

ISP

PHL

14h 55m

1 stop

6:22 pm - 11:42 pm

PHL

ISP

29h 20m

1 stop

$272Frontier

Thu, Feb 19 - Mon, Feb 23

9:43 pm - 10:37 am

ISP

PHL

12h 54m

1 stop

10:45 pm - 1:21 pm

PHL

ISP

14h 36m

2 stops

$283Multiple Airlines

Fri, Jan 30 - Sun, Feb 1

7:26 pm - 5:52 pm

ISP

PHL

22h 26m

2 stops

5:17 pm - 11:59 am

PHL

ISP

18h 42m

1 stop

$350Multiple Airlines

Thu, Jan 29 - Mon, Feb 2

9:43 pm - 2:44 pm

ISP

PHL

17h 01m

1 stop

8:30 am - 6:58 pm

PHL

ISP

10h 28m

1 stop

$376Frontier

Fri, Jan 30 - Sun, Feb 1

7:43 pm - 5:52 pm

ISP

PHL

22h 09m

1 stop

5:17 pm - 11:59 am

PHL

ISP

18h 42m

1 stop

$400Multiple Airlines

Thu, Jan 29 - Mon, Feb 2

9:59 am - 5:38 pm

ISP

PHL

7h 39m

1 stop

8:25 am - 6:44 pm

PHL

ISP

10h 19m

1 stop

$755Multiple Airlines

Thu, Apr 16 - Mon, Apr 20

Frontier flights from Islip, New York to Philadelphia

Our best Frontier deals on Islip, New York to Philadelphia flight tickets

Frontier

Feb 19

ISP5:07 pmIslip Long Island

14h 55m

1 stop

PHL8:02 amPhiladelphia

Feb 23

PHL6:22 pmPhiladelphia

29h 20m

1 stop

ISP11:42 pmIslip Long Island

$272

Frontier

Jan 30

ISP9:43 pmIslip Long Island

17h 01m

1 stop

PHL2:44 pmPhiladelphia

Feb 1

PHL8:30 amPhiladelphia

10h 28m

1 stop

ISP6:58 pmIslip Long Island

$376

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 2/19

5:07 pm-8:02 am

1 stop14h 55m

Philadelphia

Mon 2/23

10:59 pm-11:10 am

2 stops36h 11m

$208

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 2/17

8:00 am-3:01 pm

1 stop31h 01m

Philadelphia

Tue 2/24

4:09 pm-11:10 am

2 stops19h 01m

$245

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 2/17

8:00 am-3:01 pm

1 stop31h 01m

Philadelphia

Tue 2/24

6:54 pm-11:10 am

1 stop16h 16m

$256

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 2/19

5:07 pm-8:02 am

1 stop14h 55m

Philadelphia

Mon 2/23

6:22 pm-11:42 pm

1 stop29h 20m

$272

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 1/30

9:43 pm-10:37 am

1 stop12h 54m

Philadelphia

Sun 2/1

10:45 pm-1:21 pm

2 stops14h 36m

$283

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 1/29

7:26 pm-5:52 pm

2 stops22h 26m

Philadelphia

Mon 2/2

5:17 pm-11:59 am

1 stop18h 42m

$350

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 1/30

9:43 pm-2:44 pm

1 stop17h 01m

Philadelphia

Sun 2/1

8:30 am-6:58 pm

1 stop10h 28m

$376

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 1/29

7:43 pm-5:52 pm

1 stop22h 09m

Philadelphia

Mon 2/2

5:17 pm-11:59 am

1 stop18h 42m

$400

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 4/16

9:59 am-5:38 pm

1 stop7h 39m

Philadelphia

Mon 4/20

8:25 am-6:44 pm

1 stop10h 19m

$755

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 1/21

11:50 am-7:00 pm

1 stop7h 10m

$112

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first

How to get the cheapest flight ticket from Islip, New York to Philadelphia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest day to depart on your flight to Philadelphia?

The cheapest day to depart from Islip, New York to Philadelphia is on a Wednesday. Travelers who choose to depart for Philadelphia on a Wednesday will often find tickets for as low as $416. On the other hand, Sunday is the most expensive day to depart from Islip, New York because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $594.

What is the cheapest time of day to depart on your flight to Philadelphia?

According to our data, the cheapest time of day to fly to Philadelphia is in the morning. momondo users have found flights departing from Islip, New York to Philadelphia in the morning for as low as $436. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is in the afternoon when prices are around $609.

When to book flights from Islip, New York to Philadelphia

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Philadelphia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Islip, New York to Philadelphia (ISP to PHL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Philadelphia

Fastest flight time	4h 27m
Direct flights	None

The fastest flight from Islip, New York to Philadelphia takes 4h 27m

There are no direct flights from Islip, New York to Philadelphia. There are no popular flight routes from Islip, New York to Philadelphia.

Search flight deals

How far is Islip Long Island to Philadelphia by plane?
There are 115.4 mi between Islip Long Island and Philadelphia. 4h 27m is a normal flight duration for this route.
When did momondo last update prices for flights from Islip Long Island Airport to Philadelphia Airport?
Prices for flights from Islip Long Island Airport to Philadelphia Airport are updated daily.
How old do you have to be to fly from Islip Long Island Airport to Philadelphia Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Philadelphia Airport.
What documentation or ID do you need to fly to Philadelphia Airport?
The required travel and health documents for your Philadelphia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Philadelphia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Wildwood

Cape May

Rehoboth Beach

Wildwood Crest

Ocean City

King of Prussia

Cherry Hill

Newark

Dewey Beach

Reading

North Wildwood

Avalon

Dover

Lewes

Stone Harbor

Essington

Vineland

New Castle

Pottstown

Elkton

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Philadelphia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Islip to Philadelphia for you.

Can I find flights from Islip to Philadelphia with flexible booking policies on momondo?

All flight searches from Islip to Philadelphia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to Philadelphia?

Once you have performed a search for Islip to Philadelphia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Islip to Philadelphia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Philadelphia from Islip. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.