$96 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 5/27. 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

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

Tue, May 26 - Thu, May 28
Frontier Logo
6:02 pm - 11:13 pm
ISP
-
ORD
30h 11m
1 stop
Frontier Logo
5:11 pm - 10:05 am
ORD
-
ISP
15h 54m
1 stop
$203Frontier
Tue, May 26 - Tue, Jun 2
Multiple Airlines Logo
6:02 pm - 11:13 pm
ISP
-
ORD
30h 11m
1 stop
Multiple Airlines Logo
1:18 pm - 10:05 am
ORD
-
ISP
19h 47m
2 stops
$214Multiple Airlines
Fri, Apr 24 - Sun, Apr 26
Frontier Logo
4:07 pm - 11:19 pm
ISP
-
STL
8h 12m
1 stop
Frontier Logo
4:59 pm - 9:28 am
STL
-
ISP
15h 29m
1 stop
$215Frontier
Tue, May 26 - Tue, Jun 2
Frontier Logo
6:02 pm - 11:13 pm
ISP
-
ORD
30h 11m
1 stop
Frontier Logo
5:11 pm - 10:05 am
ORD
-
ISP
15h 54m
1 stop
$219Frontier
Mon, May 11 - Fri, May 15
Frontier Logo
11:00 am - 12:21 am
ISP
-
STL
14h 21m
1 stop
Frontier Logo
4:19 pm - 10:05 am
STL
-
ISP
16h 46m
1 stop
$224Frontier
Mon, May 11 - Fri, May 15
Frontier Logo
6:59 pm - 5:33 pm
ISP
-
STL
23h 34m
2 stops
Frontier Logo
4:19 pm - 10:05 am
STL
-
ISP
16h 46m
1 stop
$236Frontier
Thu, May 14 - Tue, May 19
Multiple Airlines Logo
11:12 am - 10:14 pm
ISP
-
ORD
12h 02m
1 stop
Multiple Airlines Logo
3:55 pm - 10:05 am
ORD
-
ISP
17h 10m
1 stop
$239Multiple Airlines
Wed, May 6 - Tue, May 12
Southwest Logo
4:10 pm - 9:05 pm
ISP
-
STL
5h 55m
1 stop
Southwest Logo
6:35 am - 11:55 am
STL
-
ISP
4h 20m
1 stop
$259Southwest
Wed, May 6 - Tue, May 12
Southwest Logo
9:00 am - 3:15 pm
ISP
-
STL
7h 15m
1 stop
Southwest Logo
2:30 pm - 10:10 pm
STL
-
ISP
6h 40m
2 stops
$264Southwest
Wed, May 6 - Tue, May 12
Southwest Logo
12:30 pm - 8:00 pm
ISP
-
STL
8h 30m
2 stops
Southwest Logo
2:10 pm - 10:40 pm
STL
-
ISP
7h 30m
2 stops
$269Southwest
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 ($215) and Southwest ($259).

Good to know

Low seasonMay
Cheapest flight$96
Best time to beat the crowds with an average 44% drop in price.
Most popular time to fly and prices are also 10% lower on average.
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 4331 reviews
8.0Comfort
8.6Crew
8.1Boarding
7.5Entertainment
7.0Food
Airline reviews

The new boarding process was easy and straightforward. Very pleasant.

10.0 ExcellentAnonymous, Apr 2026
LAS - OKC
Read more Southwest reviews

The new boarding process was easy and straightforward. Very pleasant.

The flight was okay. The pilots did an amazing job and kept us updated on the flight. The flight attendants were okay. They found time to be chatty with each other rather than focus on the guests. One of the attendants was a little less warm when asking about my bag I had on my lap that I was using during latter part of the mid- flight. Mind you, it was not the departure descent. I’m respectful to each and every attendant, it was the tone in her voice reminding me to place my carryon bag on the floor. I hope to have a better experience next time.

The entire travel day was a disaster from beginning to end. Woke up at two in the morning to make it to San Juan airport in time for a 5:30 am flight to Milwaukee which connected in Baltimore. Massive delays lead to me missing original connection out of Baltimore. Sixteen hours of delays/rebooking/layover time later, arrived in Milwaukee to find that only one of two checked bags made it there (despite the fact that Southwest brought another 737 jet to San Juan to fly us out to our original Baltimore connection—-not squeezed into another booked flight). The flight from Baltimore to Milwaukee was barely half full, so there was no logical reason to ship my bags out of Baltimore on a different flight to Chicago to then ship to Milwaukee. Southwest decided that my bags should not have been on the same connecting flight I WAS ON to Milwaukee, and then proceeded to accidentally leave my larger bag with the important items in Chicago. Terrible logic and support all around. Extremely angered and disappointed with SW. What a clownish operation your company has become!

It was as expected and I was grateful for the wheel chair help and ease of use.

One of the best airlines for fast boarding, on time arrivals, and top notch service!

The new seat assignment thing is wierd. If you don’t pay for a seat they always assign you a middle seat regardless of how many people are on the flight. Idk… the new company that bought Southwest is trying to make it more profitable, but I’m just not seeing it. The flight attendants aren’t having as much fun anymore. It just feels like the airline is slowly dying. IMO. We shall see if Southwest is the next Toy’s R Us.

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Communication about the delayed flight was poor. We were told to move gates three times but that was bad information. We went from gate 128 to gate 126 and then to gate 123 and back to gate 126. Communication about the delay was bad. Ended up being 1 1/2 hour late getting home.

Plane was late. Zero service for 2+ hour flight and it was not that bumpy.

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

Information on your arrival and departure airports