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

Frontier and JetBlue are the most popular carriers operating from Islip Long Island to Philadelphia

What airlines fly to Philadelphia?

United Airlines, JetBlue and American Airlines are the top three most popular airlines that fly to Philadelphia from Islip, New York according to our data. United Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 3 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

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.

$166 Cheap Flights from Islip to Philadelphia in 2025/26

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Find the cheapest flights from Islip, New York to Philadelphia

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 7:43 pmISP-PHL

13h 43m1 stop

4:12 pm - 9:13 amPHL-ISP

17h 01m2 stops

$166Frontier

Find Deal

Wed, Dec 10 - Fri, Dec 12

6:00 am - 7:43 pmISP-PHL

13h 43m1 stop

10:00 pm - 9:13 amPHL-ISP

11h 13m1 stop

$168Frontier

Find Deal

Wed, Dec 10 - Fri, Dec 12

2:19 pm - 8:25 pmISP-PHL

30h 06m2 stops

5:25 am - 1:09 pmPHL-ISP

7h 44m1 stop

$314Multiple Airlines

Find Deal

Tue, Dec 23 - Mon, Dec 29

6:00 am - 10:17 pmISP-PHL

16h 17m2 stops

10:00 pm - 1:09 pmPHL-ISP

15h 09m1 stop

$340Frontier

Find Deal

Fri, Jan 2 - Sun, Jan 4

12:20 pm - 12:48 amISP-PHL

12h 28m1 stop

10:00 pm - 11:25 amPHL-ISP

13h 25m1 stop

$401Frontier

Find Deal

Tue, Dec 23 - Mon, Dec 29

6:00 am - 12:13 amISP-PHL

18h 13m1 stop

5:01 am - 11:59 pmPHL-ISP

18h 58m1 stop

$416Frontier

Find Deal

Fri, Jan 2 - Sun, Jan 4

12:20 pm - 12:48 amISP-PHL

12h 28m1 stop

6:00 am - 11:25 amPHL-ISP

29h 25m2 stops

$456Frontier

Find Deal

Tue, Dec 23 - Mon, Dec 29

6:00 am - 5:32 amISP-PHL

23h 32m2 stops

10:20 pm - 10:09 amPHL-ISP

11h 49m1 stop

$471Frontier

Find Deal

Tue, Nov 25 - Sat, Nov 29

11:03 am - 12:39 amISP-PHL

13h 36m1 stop

10:20 pm - 10:09 amPHL-ISP

11h 49m1 stop

$479Frontier

Find Deal

Tue, Nov 25 - Sat, Nov 29

9:44 pm - 11:17 pmISP-PHL

25h 33m2 stops

8:54 pm - 4:15 pmPHL-ISP

19h 21m2 stops

$652Multiple Airlines

Find Deal

Tue, Dec 23 - Mon, Dec 29

Frontier flights from Islip, New York to Philadelphia

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

Frontier

Dec 10

ISP6:00 amIslip Long Island

13h 43m

1 stop

PHL7:43 pmPhiladelphia

Dec 12

PHL4:12 pmPhiladelphia

17h 01m

2 stops

ISP9:13 amIslip Long Island

$166

Find similar

Frontier

Dec 10

ISP6:00 amIslip Long Island

13h 43m

1 stop

PHL7:43 pmPhiladelphia

Dec 12

PHL10:00 pmPhiladelphia

11h 13m

1 stop

ISP9:13 amIslip Long Island

$168

Find similar

Frontier

Jan 2

ISP6:00 amIslip Long Island

16h 17m

2 stops

PHL10:17 pmPhiladelphia

Jan 4

PHL10:00 pmPhiladelphia

15h 09m

1 stop

ISP1:09 pmIslip Long Island

$340

Find similar

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

Wed 12/10

6:00 am-7:43 pm

1 stop13h 43m

Philadelphia

Fri 12/12

4:12 pm-9:13 am

2 stops17h 01m

$166

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 12/10

6:00 am-7:43 pm

1 stop13h 43m

Philadelphia

Fri 12/12

10:00 pm-9:13 am

1 stop11h 13m

$168

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/23

2:19 pm-8:25 pm

2 stops30h 06m

Philadelphia

Mon 12/29

5:25 am-1:09 pm

1 stop7h 44m

$314

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 1/2

6:00 am-10:17 pm

2 stops16h 17m

Philadelphia

Sun 1/4

10:00 pm-1:09 pm

1 stop15h 09m

$340

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/23

12:20 pm-12:48 am

1 stop12h 28m

Philadelphia

Mon 12/29

10:00 pm-11:25 am

1 stop13h 25m

$401

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 1/2

6:00 am-12:13 am

1 stop18h 13m

Philadelphia

Sun 1/4

5:01 am-11:59 pm

1 stop18h 58m

$416

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/23

12:20 pm-12:48 am

1 stop12h 28m

Philadelphia

Mon 12/29

6:00 am-11:25 am

2 stops29h 25m

$456

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 11/25

6:00 am-5:32 am

2 stops23h 32m

Philadelphia

Sat 11/29

10:20 pm-10:09 am

1 stop11h 49m

$471

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 11/25

11:03 am-12:39 am

1 stop13h 36m

Philadelphia

Sat 11/29

10:20 pm-10:09 am

1 stop11h 49m

$479

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/23

9:44 pm-11:17 pm

2 stops25h 33m

Philadelphia

Mon 12/29

8:54 pm-4:15 pm

2 stops19h 21m

$652

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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 Friday. Travelers who choose to depart for Philadelphia on a Friday will often find tickets for as low as $445. 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 $815.

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 at noon. momondo users have found flights departing from Islip, New York to Philadelphia at noon for as low as $401. 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 $713.

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

Direct flights	None

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. 12h 28m 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.

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Ocean City

Wildwood Crest

King of Prussia

Cherry Hill

Dewey Beach

Newark

Reading

North Wildwood

Dover

Avalon

Lewes

Stone Harbor

Essington

Vineland

Pottstown

New Castle

Somers Point

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.