$121 Find Cheap Flights from Islip to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to Illinois departing on 8/25. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Illinois, as well as popular online travel agencies
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Flight Deals
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Flight Deals

Book Cheap Islip to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to Illinois

Sat, May 30 - Sun, May 31
Frontier Logo
7:30 am - 2:19 pm
ISP
-
ORD
7h 49m
1 stop
Frontier Logo
5:14 pm - 9:08 am
ORD
-
ISP
14h 54m
1 stop
$181Frontier
Sat, Apr 11 - Thu, Apr 16
Frontier Logo
8:39 pm - 11:36 pm
ISP
-
ORD
27h 57m
1 stop
Frontier Logo
3:08 pm - 7:36 pm
ORD
-
ISP
27h 28m
1 stop
$202Frontier
Sun, Mar 15 - Thu, Mar 19
Frontier Logo
4:34 pm - 7:02 am
ISP
-
STL
15h 28m
1 stop
Frontier Logo
9:05 pm - 10:03 am
STL
-
ISP
11h 58m
1 stop
$250Frontier
Thu, Apr 16 - Mon, Apr 20
Southwest Logo
5:10 pm - 11:40 pm
ISP
-
STL
7h 30m
1 stop
Southwest Logo
4:00 pm - 11:30 pm
STL
-
ISP
6h 30m
1 stop
$271Southwest
Thu, May 14 - Mon, May 18
Multiple Airlines Logo
4:07 pm - 9:05 am
ISP
-
ORD
17h 58m
1 stop
Multiple Airlines Logo
4:38 pm - 1:18 pm
ORD
-
ISP
19h 40m
2 stops
$272Multiple Airlines
Sun, Mar 15 - Thu, Mar 19
Frontier Logo
4:34 pm - 7:02 am
ISP
-
STL
15h 28m
1 stop
Frontier Logo
4:51 pm - 12:47 pm
STL
-
ISP
18h 56m
1 stop
$275Frontier
Thu, Apr 16 - Mon, Apr 20
Southwest Logo
5:10 pm - 11:40 pm
ISP
-
STL
7h 30m
1 stop
Southwest Logo
2:10 pm - 11:30 pm
STL
-
ISP
8h 20m
2 stops
$276Southwest
Thu, Apr 16 - Sun, Apr 19
Multiple Airlines Logo
4:07 pm - 9:05 am
ISP
-
ORD
17h 58m
1 stop
Multiple Airlines Logo
1:12 pm - 1:31 pm
ORD
-
ISP
23h 19m
1 stop
$289Multiple Airlines
Thu, Jul 30 - Sat, Aug 1
Frontier Logo
10:03 am - 11:41 pm
ISP
-
ORD
14h 38m
1 stop
Frontier Logo
5:14 pm - 9:08 am
ORD
-
ISP
14h 54m
1 stop
$290Frontier
Thu, Apr 16 - Mon, Apr 20
Southwest Logo
8:35 am - 3:25 pm
ISP
-
STL
7h 50m
2 stops
Southwest Logo
2:10 pm - 11:30 pm
STL
-
ISP
8h 20m
2 stops
$334Southwest
Booking Insights

KAYAK's insights & trends for Islip to Illinois flights

Get data-powered insights and trends into flights from Islip to Illinois to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Islip to Illinois?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Islip to Illinois were found on Frontier ($250) and Southwest ($271).

Good to know

Low seasonApril
Cheapest flight$121
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly with an average 11% increase in price.
Flight from Islip to Chicago

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Islip to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Islip to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Islip to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Islip to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Islip to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Islip to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Islip to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Islip to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Islip to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Islip to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Islip to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4308 reviews
8.6Crew
8.0Comfort
7.5Entertainment
7.0Food
8.1Boarding
Airline reviews

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

4.0 OkayEmma, Mar 2026
LAX - PHX
Read more Southwest reviews

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The last 3 flights between BWI and BDL canceled the beverage service mid- way. Just say up front that the fight is too short. Thanks!

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

The WiFi and crew on the plane were good, however, the boarding experience was awful. I paid for the Choice Preferred and was boarded in group 5 so all overhead storage was full. They found room for our luggage, but further back making getting off the plane a nightmare. Also, we were in row 6 and the seats were extremely uncomfortable. Both my daughter and I had no leg room and couldn’t wait to get off the plane.

The charges were ridiculous for an hour flight and the turbulence was very scary.

Everything you need to know for your flight from Islip to Illinois

Information on your arrival and departure airports