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

Prices for flights from Islip Long Island Airport to Illinois were last updated today.

How many operators does momondo search for flights from Islip Long Island Airport to Illinois?

As of February 2026, there is 1 operator available to choose from for flights from Islip Long Island Airport to Illinois.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$70 Cheap Flights from Islip to Illinois in 2026

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Find the cheapest flights from Islip, New York to Illinois

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:34 pm - 11:59 pm

ISP

STL

9h 25m

1 stop

3:49 pm - 7:38 am

STL

ISP

14h 49m

1 stop

$228Frontier

Thu, Feb 26 - Sun, Mar 1

4:07 pm - 3:25 pm

ISP

ORD

24h 18m

1 stop

10:25 am - 9:13 am

ORD

ISP

21h 48m

1 stop

$250Frontier

Fri, May 8 - Sun, May 10

4:07 pm - 7:59 am

ISP

ORD

16h 52m

1 stop

6:31 am - 9:13 am

ORD

ISP

25h 42m

2 stops

$267Multiple Airlines

Sun, May 3 - Thu, May 7

4:07 pm - 7:59 am

ISP

ORD

16h 52m

1 stop

10:25 am - 9:13 am

ORD

ISP

21h 48m

1 stop

$282Multiple Airlines

Sun, May 3 - Thu, May 7

3:34 pm - 6:51 am

ISP

STL

16h 17m

2 stops

3:49 pm - 7:38 am

STL

ISP

14h 49m

1 stop

$292Multiple Airlines

Thu, Feb 26 - Sun, Mar 1

6:00 am - 7:44 pm

ISP

ORD

14h 44m

1 stop

4:44 pm - 11:10 am

ORD

ISP

17h 26m

2 stops

$307Multiple Airlines

Fri, Mar 6 - Fri, Mar 13

4:07 pm - 7:59 am

ISP

ORD

16h 52m

1 stop

4:38 pm - 1:18 pm

ORD

ISP

19h 40m

2 stops

$313Multiple Airlines

Fri, May 15 - Mon, May 18

4:07 pm - 2:17 pm

ISP

ORD

23h 10m

1 stop

8:24 pm - 2:55 pm

ORD

ISP

17h 31m

1 stop

$365Frontier

Thu, Apr 30 - Sun, May 3

1:10 pm - 9:25 pm

ISP

STL

9h 15m

2 stops

3:10 pm - 11:30 pm

STL

ISP

7h 20m

2 stops

$397Southwest

Thu, Feb 26 - Sun, Mar 1

12:40 pm - 7:00 pm

ISP

STL

7h 20m

2 stops

12:40 pm - 11:30 pm

STL

ISP

9h 50m

2 stops

$619Southwest

Wed, Feb 18 - Sun, Feb 22

Frontier flights from Islip, New York to Illinois

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

Frontier

Feb 26

ISP3:34 pmIslip Long Island

9h 25m

1 stop

STL11:59 pmLambert-St Louis

Mar 1

STL3:49 pmLambert-St Louis

14h 49m

1 stop

ISP7:38 amIslip Long Island

$228

Frontier

May 8

ISP4:07 pmIslip Long Island

24h 18m

1 stop

ORD3:25 pmChicago O'Hare Intl

May 10

ORD10:25 amChicago O'Hare Intl

21h 48m

1 stop

ISP9:13 amIslip Long Island

$250

Frontier

Apr 30

ISP4:07 pmIslip Long Island

23h 10m

1 stop

ORD2:17 pmChicago O'Hare Intl

May 3

ORD8:24 pmChicago O'Hare Intl

17h 31m

1 stop

ISP2:55 pmIslip Long Island

$365

Southwest flights from Islip, New York to Illinois

Our best Southwest deals on Islip, New York to Illinois flight tickets

Southwest

May 3

ISP6:05 amIslip Long Island

11h 00m

2 stops

ORD4:05 pmChicago O'Hare Intl

May 7

ORD2:40 pmChicago O'Hare Intl

7h 50m

2 stops

ISP11:30 pmIslip Long Island

$374

Southwest

Apr 30

ISP6:50 amIslip Long Island

8h 30m

1 stop

ORD2:20 pmChicago O'Hare Intl

May 3

ORD7:35 pmChicago O'Hare Intl

15h 15m

2 stops

ISP11:50 amIslip Long Island

$375

Southwest

May 15

ISP12:30 pmIslip Long Island

10h 25m

2 stops

ORD9:55 pmChicago O'Hare Intl

May 18

ORD6:00 amChicago O'Hare Intl

13h 25m

2 stops

ISP8:25 pmIslip Long Island

$380

Fly from

Fly to

Route

Depart

Return

Price

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 2/26

3:34 pm-11:59 pm

1 stop9h 25m

Lambert-St Louis

Sun 3/1

3:49 pm-7:38 am

1 stop14h 49m

$228

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Fri 5/8

4:07 pm-3:25 pm

1 stop24h 18m

Chicago O'Hare Intl

Sun 5/10

10:25 am-9:13 am

1 stop21h 48m

$250

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sun 5/3

4:07 pm-7:59 am

1 stop16h 52m

Chicago O'Hare Intl

Thu 5/7

6:31 am-9:13 am

2 stops25h 42m

$267

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sun 5/3

4:07 pm-7:59 am

1 stop16h 52m

Chicago O'Hare Intl

Thu 5/7

10:25 am-9:13 am

1 stop21h 48m

$282

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 2/26

3:34 pm-6:51 am

2 stops16h 17m

Lambert-St Louis

Sun 3/1

3:49 pm-7:38 am

1 stop14h 49m

$292

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Fri 3/6

6:00 am-7:44 pm

1 stop14h 44m

Chicago O'Hare Intl

Fri 3/13

4:44 pm-11:10 am

2 stops17h 26m

$307

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Fri 5/15

4:07 pm-7:59 am

1 stop16h 52m

Chicago O'Hare Intl

Mon 5/18

4:38 pm-1:18 pm

2 stops19h 40m

$313

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Thu 4/30

4:07 pm-2:17 pm

1 stop23h 10m

Chicago O'Hare Intl

Sun 5/3

8:24 pm-2:55 pm

1 stop17h 31m

$365

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 2/26

1:10 pm-9:25 pm

2 stops9h 15m

Lambert-St Louis

Sun 3/1

3:10 pm-11:30 pm

2 stops7h 20m

$397

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Wed 2/18

12:40 pm-7:00 pm

2 stops7h 20m

Lambert-St Louis

Sun 2/22

12:40 pm-11:30 pm

2 stops9h 50m

$619

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

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

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

Frontier and Southwest are the most popular carriers operating from Islip Long Island to Illinois

What airlines fly to Illinois?

United Airlines, American Airlines and Spirit Airlines are the top three most popular airlines that fly to Illinois from Islip, New York according to our data. United Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 7 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

Cheap Islip, New York to Illinois flight deals and tips

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

Fastest flight time	7h 45m
Direct flights	None

The fastest flight from Islip, New York to Illinois takes 7h 45m

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

Search flight deals

When did momondo last update prices for flights from Islip Long Island Airport to Illinois?
Prices for flights from Islip Long Island Airport to Illinois were last updated today.
How many operators does momondo search for flights from Islip Long Island Airport to Illinois?
As of February 2026, there is 1 operator available to choose from for flights from Islip Long Island Airport to Illinois.
How old do you have to be to fly from Islip Long Island Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Islip, New York to Illinois

Compare and see reviews for airlines that fly from Islip, New York to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Southwest	PriceFrom $366	Free Cancellation	Rating 8.0 4,274 reviews		Search Southwest flights

Why use momondo?

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

It is quick and easy to find Islip to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

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

momondo does allow users to show only those flights to Illinois from Islip which offer a flexible booking policy as well as other useful filters and features.

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

Once all potential Islip to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to Illinois, momondo offers a useful price alert feature which will track prices for flights to Illinois from Islip and alert you when they change.