What airlines fly to Philadelphia?

United Airlines, JetBlue and American Airlines are the top three most popular airlines that fly to Philadelphia from Islip according to our data. United Airlines is the first choice among our users, with 37% 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.

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

JetBlue and Frontier are the most popular carriers 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.

$158 Cheap Flights from Islip to Philadelphia in 2025/26

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Find the cheapest flights from Islip to Philadelphia

Round-trip

One-way

Last minute

Cheap round-trip flights

11:25 am - 9:11 pmISP-PHL

9h 46m1 stop

11:34 am - 8:42 pmPHL-ISP

9h 08m1 stop

$158Frontier

Find Deal

Tue, Sep 30 - Tue, Oct 7

11:40 am - 5:45 pmISP-PHL

6h 05m1 stop

8:00 am - 4:27 pmPHL-ISP

8h 27m1 stop

$209Frontier

Find Deal

Mon, Sep 29 - Fri, Oct 3

11:40 am - 12:52 amISP-PHL

13h 12m1 stop

11:16 am - 8:42 pmPHL-ISP

9h 26m1 stop

$219Frontier

Find Deal

Thu, Oct 2 - Thu, Oct 9

8:47 pm - 12:53 pmISP-PHL

40h 06m2 stops

10:04 pm - 8:42 pmPHL-ISP

22h 38m1 stop

$291

Find Deal

Mon, Oct 13 - Mon, Oct 20

4:58 pm - 12:53 pmISP-PHL

19h 55m1 stop

6:58 pm - 8:42 pmPHL-ISP

25h 44m1 stop

$318

Find Deal

Mon, Oct 13 - Mon, Oct 20

7:30 am - 9:46 amISP-PHL

26h 16m2 stops

7:58 pm - 4:15 pmPHL-ISP

20h 17m2 stops

$896

Find Deal

Mon, Oct 13 - Mon, Oct 20

Frontier flights from Islip to Philadelphia

Our best Frontier deals on Islip to Philadelphia flight tickets

Frontier

Sep 30

ISP11:25 amIslip Long Island

9h 46m

1 stop

PHL9:11 pmPhiladelphia

Oct 7

PHL11:34 amPhiladelphia

9h 08m

1 stop

ISP8:42 pmIslip Long Island

$158

Find similar

Frontier

Sep 29

ISP11:40 amIslip Long Island

6h 05m

1 stop

PHL5:45 pmPhiladelphia

Oct 3

PHL8:00 amPhiladelphia

8h 27m

1 stop

ISP4:27 pmIslip Long Island

$209

Find similar

Frontier

Oct 2

ISP11:40 amIslip Long Island

13h 12m

1 stop

PHL12:52 amPhiladelphia

Oct 9

PHL11:16 amPhiladelphia

9h 26m

1 stop

ISP8:42 pmIslip Long Island

$219

Find similar

Fly from

Fly to

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

Mon 9/29

11:40 am-5:45 pm

1 stop6h 05m

Philadelphia

Fri 10/3

8:00 am-4:27 pm

1 stop8h 27m

$209

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

$219

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 10/13

8:47 pm-12:53 pm

2 stops40h 06m

Philadelphia

Mon 10/20

10:04 pm-8:42 pm

1 stop22h 38m

$291

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 10/13

4:58 pm-12:53 pm

1 stop19h 55m

Philadelphia

Mon 10/20

6:58 pm-8:42 pm

1 stop25h 44m

$318

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 10/13

7:30 am-9:46 am

2 stops26h 16m

Philadelphia

Mon 10/20

7:58 pm-4:15 pm

2 stops20h 17m

$896

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 10/18

11:35 am-7:04 pm

1 stop7h 29m

$162

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 10/17

4:58 pm-1:07 am

1 stop8h 09m

$181

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 10/17

8:47 pm-12:57 am

3 stops52h 10m

$217

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 10/17

4:58 pm-5:24 pm

2 stops24h 26m

$225

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from Islip 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 to Philadelphia is on a Friday. Travelers who choose to depart for Philadelphia on a Friday will often find tickets for as low as $405. On the other hand, Sunday is the most expensive day to depart from Islip because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $750.

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 to Philadelphia at noon for as low as $356. 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 $616.

When to book flights from Islip to Philadelphia

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

Estimated round-trip price

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

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

Direct flights	None

There are no direct flights from Islip to Philadelphia. There are no popular flight routes from Islip 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. 6h 05m 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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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.