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Cheap flights from Islip to Illinois from $80

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 to Illinois departing on 10/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Islip to Illinois

Cheap round-trip flights

Frontier Logo
9:37 pm - 3:08 pmISP-ORD
18h 31m1 stop
Frontier Logo
8:40 am - 8:59 amORD-ISP
23h 19m1 stop
$175Frontier
Find Deal
Tue, Oct 7 - Sat, Oct 11
Frontier Logo
9:47 pm - 7:10 amISP-ORD
10h 23m1 stop
Frontier Logo
5:50 pm - 10:37 amORD-ISP
15h 47m2 stops
$185Frontier
Find Deal
Sun, Oct 26 - Thu, Oct 30
Frontier Logo
4:58 pm - 11:29 pmISP-ORD
31h 31m2 stops
Frontier Logo
5:25 am - 10:37 amORD-ISP
28h 12m1 stop
$196Frontier
Find Deal
Fri, Oct 31 - Sun, Nov 2
Frontier Logo
6:37 pm - 1:17 pmISP-STL
19h 40m1 stop
Frontier Logo
7:45 pm - 10:37 amSTL-ISP
13h 52m2 stops
$201Frontier
Find Deal
Thu, Oct 30 - Tue, Nov 4
Frontier Logo
9:47 pm - 3:49 pmISP-ORD
19h 02m2 stops
Frontier Logo
5:50 pm - 10:37 amORD-ISP
15h 47m2 stops
$210Frontier
Find Deal
Sun, Oct 26 - Thu, Oct 30
Multiple Airlines Logo
4:58 pm - 9:33 pmISP-ORD
29h 35m1 stop
Multiple Airlines Logo
6:58 pm - 10:57 amORD-ISP
14h 59m1 stop
$232Multiple Airlines
Find Deal
Wed, Oct 8 - Tue, Oct 14
Southwest Logo
5:30 am - 11:30 amISP-STL
7h 00m1 stop
Southwest Logo
12:05 pm - 9:40 pmSTL-ISP
8h 35m1 stop
$241Southwest
Find Deal
Thu, Oct 30 - Tue, Nov 4
Southwest Logo
3:40 pm - 7:30 pmISP-STL
4h 50m1 stop
Southwest Logo
5:05 pm - 11:50 pmSTL-ISP
5h 45m1 stop
$282Southwest
Find Deal
Sat, Dec 6 - Sun, Dec 7
Southwest Logo
1:30 pm - 9:10 pmISP-STL
8h 40m2 stops
Southwest Logo
5:05 pm - 11:50 pmSTL-ISP
5h 45m1 stop
$287Southwest
Find Deal
Sat, Dec 6 - Sun, Dec 7
Southwest Logo
3:40 pm - 9:50 pmISP-ORD
7h 10m1 stop
Southwest Logo
11:55 am - 9:45 pmORD-ISP
8h 50m2 stops
$339Southwest
Find Deal
Wed, Nov 5 - Sat, Nov 8

Frontier flights from Islip to Illinois

Our best Frontier deals on Islip to Illinois flight tickets
Frontier
Oct 2
ISP11:40 amIslip Long Island
9h 04m
1 stop
ORD7:44 pmChicago O'Hare Intl
Oct 3
ORD8:49 pmChicago O'Hare Intl
13h 06m
1 stop
ISP10:55 amIslip Long Island
$168
Find similar
Frontier
Oct 7
ISP9:37 pmIslip Long Island
18h 31m
1 stop
ORD3:08 pmChicago O'Hare Intl
Oct 11
ORD8:40 amChicago O'Hare Intl
23h 19m
1 stop
ISP8:59 amIslip Long Island
$175
Find similar
Frontier
Oct 2
ISP11:40 amIslip Long Island
9h 04m
1 stop
ORD7:44 pmChicago O'Hare Intl
Oct 5
ORD8:49 pmChicago O'Hare Intl
12h 51m
1 stop
ISP10:40 amIslip Long Island
$184
Find similar

Southwest flights from Islip to Illinois

Our best Southwest deals on Islip to Illinois flight tickets
Southwest
Oct 30
ISP5:30 amIslip Long Island
7h 00m
1 stop
STL11:30 amLambert-St Louis
Nov 4
STL12:05 pmLambert-St Louis
8h 35m
1 stop
ISP9:40 pmIslip Long Island
$241
Find similar
Southwest
Dec 6
ISP3:40 pmIslip Long Island
4h 50m
1 stop
STL7:30 pmLambert-St Louis
Dec 7
STL5:05 pmLambert-St Louis
5h 45m
1 stop
ISP11:50 pmIslip Long Island
$282
Find similar
Southwest
Dec 6
ISP1:30 pmIslip Long Island
8h 40m
2 stops
STL9:10 pmLambert-St Louis
Dec 7
STL5:05 pmLambert-St Louis
5h 45m
1 stop
ISP11:50 pmIslip Long Island
$287
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip 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 September 24, 2025.
Use the filters below to find and compare flights from Islip to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Tue 10/7

9:37 pm-3:08 pm

1 stop18h 31m

Chicago O'Hare Intl

Sat 10/11

8:40 am-8:59 am

1 stop23h 19m

$175

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sun 10/26

9:47 pm-7:10 am

1 stop10h 23m

Chicago O'Hare Intl

Thu 10/30

5:50 pm-10:37 am

2 stops15h 47m

$185

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Fri 10/31

4:58 pm-11:29 pm

2 stops31h 31m

Chicago O'Hare Intl

Sun 11/2

5:25 am-10:37 am

1 stop28h 12m

$196

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 10/30

6:37 pm-1:17 pm

1 stop19h 40m

Lambert-St Louis

Tue 11/4

7:45 pm-10:37 am

2 stops13h 52m

$201

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Sun 10/26

9:47 pm-3:49 pm

2 stops19h 02m

Chicago O'Hare Intl

Thu 10/30

5:50 pm-10:37 am

2 stops15h 47m

$210

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Wed 10/8

4:58 pm-9:33 pm

1 stop29h 35m

Chicago O'Hare Intl

Tue 10/14

6:58 pm-10:57 am

1 stop14h 59m

$232

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 10/30

5:30 am-11:30 am

1 stop7h 00m

Lambert-St Louis

Tue 11/4

12:05 pm-9:40 pm

1 stop8h 35m

$241

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Sat 12/6

3:40 pm-7:30 pm

1 stop4h 50m

Lambert-St Louis

Sun 12/7

5:05 pm-11:50 pm

1 stop5h 45m

$282

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Sat 12/6

1:30 pm-9:10 pm

2 stops8h 40m

Lambert-St Louis

Sun 12/7

5:05 pm-11:50 pm

1 stop5h 45m

$287

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

Wed 11/5

3:40 pm-9:50 pm

1 stop7h 10m

Chicago O'Hare Intl

Sat 11/8

11:55 am-9:45 pm

2 stops8h 50m

$339

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 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 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 to Illinois flight deals and tips

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

Direct flights

None
There are no direct flights from Islip to Illinois. There are no popular flight routes from Islip to Illinois.
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  • 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 to Illinois

Compare and see reviews for airlines that fly from Islip to Illinois with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $306Free CancellationRating
8.0
4,244 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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