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Cheap flights from Islip, New York to Illinois from $81

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Illinois departing on 3/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Islip, New York to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:07 pm - 9:34 pm
ISP
-
ORD
29h 27m1 stop
Frontier Logo
8:30 am - 8:40 am
ORD
-
ISP
23h 10m1 stop
$129Frontier
Sat, Feb 21 - Tue, Feb 24
Frontier Logo
8:40 pm - 7:17 pm
ISP
-
ORD
23h 37m1 stop
Frontier Logo
8:27 pm - 7:45 pm
ORD
-
ISP
22h 18m1 stop
$163Frontier
Thu, Jan 8 - Sat, Jan 10
Frontier Logo
8:40 pm - 7:50 am
ISP
-
STL
12h 10m1 stop
Frontier Logo
9:35 am - 7:45 pm
STL
-
ISP
9h 10m1 stop
$197Frontier
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
8:40 pm - 7:50 am
ISP
-
STL
12h 10m1 stop
Frontier Logo
9:35 am - 7:45 pm
STL
-
ISP
9h 10m1 stop
$217Frontier
Thu, Jan 8 - Sun, Jan 11
Multiple Airlines Logo
7:56 pm - 7:17 pm
ISP
-
ORD
24h 21m1 stop
Multiple Airlines Logo
10:48 am - 7:51 pm
ORD
-
ISP
8h 03m1 stop
$220Multiple Airlines
Sat, Jan 10 - Mon, Jan 12
Multiple Airlines Logo
7:56 pm - 5:07 pm
ISP
-
ORD
22h 11m2 stops
Multiple Airlines Logo
7:21 pm - 11:59 am
ORD
-
ISP
15h 38m1 stop
$237Multiple Airlines
Sat, Jan 10 - Mon, Jan 12
Multiple Airlines Logo
7:56 pm - 11:35 am
ISP
-
ORD
16h 39m2 stops
Multiple Airlines Logo
10:48 am - 7:51 pm
ORD
-
ISP
8h 03m1 stop
$242Multiple Airlines
Sat, Jan 10 - Mon, Jan 12
Frontier Logo
7:33 pm - 4:35 pm
ISP
-
ORD
22h 02m1 stop
Frontier Logo
9:25 am - 8:40 am
ORD
-
ISP
22h 15m1 stop
$278Frontier
Fri, Jan 23 - Sat, Jan 31
Frontier Logo
3:34 pm - 10:47 pm
ISP
-
ORD
8h 13m1 stop
Frontier Logo
7:35 am - 5:01 pm
ORD
-
ISP
8h 26m1 stop
$282Frontier
Fri, Feb 27 - Sun, Mar 1
Multiple Airlines Logo
2:31 pm - 9:22 am
ISP
-
ORD
19h 51m2 stops
Multiple Airlines Logo
1:17 pm - 7:38 am
ORD
-
ISP
17h 21m1 stop
$291Multiple Airlines
Fri, Feb 13 - Sun, Feb 15

Frontier flights from Islip, New York to Illinois

Our best Frontier deals on Islip, New York to Illinois flight tickets
Frontier
Feb 21
ISP5:07 pmIslip Long Island
29h 27m
1 stop
ORD9:34 pmChicago O'Hare Intl
Feb 24
ORD8:30 amChicago O'Hare Intl
23h 10m
1 stop
ISP8:40 amIslip Long Island
$129
Find similar
Frontier
Jan 8
ISP8:40 pmIslip Long Island
23h 37m
1 stop
ORD7:17 pmChicago O'Hare Intl
Jan 10
ORD8:27 pmChicago O'Hare Intl
22h 18m
1 stop
ISP7:45 pmIslip Long Island
$163
Find similar
Frontier
Jan 8
ISP8:40 pmIslip Long Island
12h 10m
1 stop
STL7:50 amLambert-St Louis
Jan 11
STL9:35 amLambert-St Louis
9h 10m
1 stop
ISP7:45 pmIslip Long Island
$197
Find similar

Southwest flights from Islip, New York to Illinois

Our best Southwest deals on Islip, New York to Illinois flight tickets
Southwest
Mar 5
ISP12:15 pmIslip Long Island
7h 20m
1 stop
ORD6:35 pmChicago O'Hare Intl
Mar 8
ORD1:35 pmChicago O'Hare Intl
8h 20m
1 stop
ISP10:55 pmIslip Long Island
$397
Find similar
Southwest
May 13
ISP9:00 amIslip Long Island
10h 25m
2 stops
ORD6:25 pmChicago O'Hare Intl
May 18
ORD3:05 pmChicago O'Hare Intl
6h 25m
1 stop
ISP10:30 pmIslip Long Island
$402
Find similar
Southwest
May 13
ISP12:30 pmIslip Long Island
10h 25m
2 stops
ORD9:55 pmChicago O'Hare Intl
May 18
ORD7:35 pmChicago O'Hare Intl
15h 20m
2 stops
ISP11:55 amIslip Long Island
$403
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 21, 2025.
Use the filters below to find and compare flights from Islip, New York to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sat 2/21

5:07 pm-9:34 pm

1 stop29h 27m

Chicago O'Hare Intl

Tue 2/24

8:30 am-8:40 am

1 stop23h 10m

$129

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Thu 1/8

8:40 pm-7:17 pm

1 stop23h 37m

Chicago O'Hare Intl

Sat 1/10

8:27 pm-7:45 pm

1 stop22h 18m

$163

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 1/8

8:40 pm-7:50 am

1 stop12h 10m

Lambert-St Louis

Sun 1/11

9:35 am-7:45 pm

1 stop9h 10m

$197

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 1/8

8:40 pm-7:50 am

1 stop12h 10m

Lambert-St Louis

Sun 1/11

9:35 am-7:45 pm

1 stop9h 10m

$217

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sat 1/10

7:56 pm-7:17 pm

1 stop24h 21m

Chicago O'Hare Intl

Mon 1/12

10:48 am-7:51 pm

1 stop8h 03m

$220

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sat 1/10

7:56 pm-5:07 pm

2 stops22h 11m

Chicago O'Hare Intl

Mon 1/12

7:21 pm-11:59 am

1 stop15h 38m

$237

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sat 1/10

7:56 pm-11:35 am

2 stops16h 39m

Chicago O'Hare Intl

Mon 1/12

10:48 am-7:51 pm

1 stop8h 03m

$242

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Fri 1/23

7:33 pm-4:35 pm

1 stop22h 02m

Chicago O'Hare Intl

Sat 1/31

9:25 am-8:40 am

1 stop22h 15m

$278

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Fri 2/27

3:34 pm-10:47 pm

1 stop8h 13m

Chicago O'Hare Intl

Sun 3/1

7:35 am-5:01 pm

1 stop8h 26m

$282

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Fri 2/13

2:31 pm-9:22 am

2 stops19h 51m

Chicago O'Hare Intl

Sun 2/15

1:17 pm-7:38 am

1 stop17h 21m

$291

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

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 time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is at noon. Flights from Islip, New York to Illinois during this time can be as low as $259. Flights in the afternoon are often more expensive with an average ticket price of $305.

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 25m

Direct flights

None
The fastest flight from Islip, New York to Illinois takes 6h 25m
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?

  • 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
SouthwestPriceFrom $336Free CancellationRating
8.0
4,257 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.

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