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 48% 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.

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

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

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 May 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.

$115 Cheap Flights from Islip, New York to Illinois in 2026

1 adult

0 bags

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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.

9:52 pm - 11:49 pm

ISP

STL

26h 57m

1 stop

4:17 pm - 8:57 pm

STL

ISP

27h 40m

1 stop

$201Frontier

Wed, Jun 10 - Tue, Jun 16

11:00 am - 11:13 pm

ISP

ORD

13h 13m

1 stop

5:11 pm - 5:17 pm

ORD

ISP

23h 06m

1 stop

$261Frontier

Thu, May 28 - Mon, Jun 1

11:00 am - 11:57 pm

ISP

STL

13h 57m

1 stop

4:19 pm - 10:05 am

STL

ISP

16h 46m

1 stop

$262Frontier

Fri, Jun 5 - Sun, Jun 7

11:00 am - 11:13 pm

ISP

ORD

13h 13m

1 stop

5:11 pm - 5:17 pm

ORD

ISP

23h 06m

1 stop

$280Frontier

Sat, May 30 - Mon, Jun 1

12:25 pm - 6:25 pm

ISP

STL

7h 00m

2 stops

3:30 pm - 10:35 pm

STL

ISP

6h 05m

1 stop

$284Southwest

Wed, Jun 10 - Tue, Jun 16

11:00 am - 11:13 pm

ISP

ORD

13h 13m

1 stop

5:11 pm - 5:17 pm

ORD

ISP

23h 06m

1 stop

$292Frontier

Sat, May 30 - Mon, Jun 1

12:25 pm - 6:25 pm

ISP

STL

7h 00m

2 stops

3:15 pm - 10:35 pm

STL

ISP

6h 20m

2 stops

$338Southwest

Wed, Jun 10 - Tue, Jun 16

5:00 pm - 10:25 pm

ISP

STL

6h 25m

1 stop

4:15 pm - 10:05 pm

STL

ISP

4h 50m

1 stop

$345Southwest

Fri, Aug 21 - Mon, Aug 24

12:30 pm - 6:30 pm

ISP

STL

7h 00m

2 stops

6:45 pm - 11:35 pm

STL

ISP

3h 50m

1 stop

$348Southwest

Thu, Jul 9 - Sun, Jul 12

2:28 pm - 7:29 pm

ISP

ORD

30h 01m

2 stops

5:11 pm - 10:15 am

ORD

ISP

16h 04m

1 stop

$360Multiple Airlines

Mon, Jun 1 - Fri, Jun 5

Frontier flights from Islip, New York to Illinois

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

Frontier

Jun 10

ISP9:52 pmIslip Long Island

26h 57m

1 stop

STL11:49 pmLambert-St Louis

Jun 16

STL4:17 pmLambert-St Louis

27h 40m

1 stop

ISP8:57 pmIslip Long Island

$201

Frontier

May 28

ISP11:00 amIslip Long Island

13h 13m

1 stop

ORD11:13 pmChicago O'Hare Intl

Jun 1

ORD5:11 pmChicago O'Hare Intl

23h 06m

1 stop

ISP5:17 pmIslip Long Island

$261

Frontier

Jun 5

ISP11:00 amIslip Long Island

13h 57m

1 stop

STL11:57 pmLambert-St Louis

Jun 7

STL4:19 pmLambert-St Louis

16h 46m

1 stop

ISP10:05 amIslip Long Island

$262

Southwest flights from Islip, New York to Illinois

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

Southwest

Jun 10

ISP12:25 pmIslip Long Island

7h 00m

2 stops

STL6:25 pmLambert-St Louis

Jun 16

STL3:30 pmLambert-St Louis

6h 05m

1 stop

ISP10:35 pmIslip Long Island

$284

Southwest

Jun 10

ISP12:25 pmIslip Long Island

7h 00m

2 stops

STL6:25 pmLambert-St Louis

Jun 16

STL3:15 pmLambert-St Louis

6h 20m

2 stops

ISP10:35 pmIslip Long Island

$338

Southwest

Aug 21

ISP5:00 pmIslip Long Island

6h 25m

1 stop

STL10:25 pmLambert-St Louis

Aug 24

STL4:15 pmLambert-St Louis

4h 50m

1 stop

ISP10:05 pmIslip Long Island

$345

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Wed 6/10

9:52 pm-11:49 pm

1 stop26h 57m

Lambert-St Louis

Tue 6/16

4:17 pm-8:57 pm

1 stop27h 40m

$201

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Thu 5/28

11:00 am-11:13 pm

1 stop13h 13m

Chicago O'Hare Intl

Mon 6/1

5:11 pm-5:17 pm

1 stop23h 06m

$261

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Fri 6/5

11:00 am-11:57 pm

1 stop13h 57m

Lambert-St Louis

Sun 6/7

4:19 pm-10:05 am

1 stop16h 46m

$262

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sat 5/30

11:00 am-11:13 pm

1 stop13h 13m

Chicago O'Hare Intl

Mon 6/1

5:11 pm-5:17 pm

1 stop23h 06m

$280

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Wed 6/10

12:25 pm-6:25 pm

2 stops7h 00m

Lambert-St Louis

Tue 6/16

3:30 pm-10:35 pm

1 stop6h 05m

$284

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sat 5/30

11:00 am-11:13 pm

1 stop13h 13m

Chicago O'Hare Intl

Mon 6/1

5:11 pm-5:17 pm

1 stop23h 06m

$292

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Wed 6/10

12:25 pm-6:25 pm

2 stops7h 00m

Lambert-St Louis

Tue 6/16

3:15 pm-10:35 pm

2 stops6h 20m

$338

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Fri 8/21

5:00 pm-10:25 pm

1 stop6h 25m

Lambert-St Louis

Mon 8/24

4:15 pm-10:05 pm

1 stop4h 50m

$345

Quickest round-trip

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 7/9

12:30 pm-6:30 pm

2 stops7h 00m

Lambert-St Louis

Sun 7/12

6:45 pm-11:35 pm

1 stop3h 50m

$348

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Mon 6/1

2:28 pm-7:29 pm

2 stops30h 01m

Chicago O'Hare Intl

Fri 6/5

5:11 pm-10:15 am

1 stop16h 04m

$360

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

Prices

Airlines

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Islip, New York is in October. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of October, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $0.

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	6h 20m
Direct flights	None

The fastest flight from Islip, New York to Illinois takes 6h 20m

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

Frequently asked questions about flying from Islip, New York to Illinois

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 May 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.

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.