$78 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 5/3. 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

Sun, Apr 19 - Thu, Apr 23
Frontier Logo
8:31 pm - 1:09 am
ISP
-
ORD
29h 38m
1 stop
Frontier Logo
2:05 pm - 9:13 am
ORD
-
ISP
18h 08m
1 stop
$182Frontier
Sun, Apr 19 - Thu, Apr 23
Frontier Logo
8:31 pm - 1:09 am
ISP
-
ORD
29h 38m
1 stop
Frontier Logo
2:05 pm - 9:13 am
ORD
-
ISP
18h 08m
1 stop
$201Frontier
Mon, Apr 27 - Mon, May 4
Multiple Airlines Logo
4:07 pm - 1:00 pm
ISP
-
ORD
21h 53m
1 stop
Multiple Airlines Logo
1:27 pm - 10:05 am
ORD
-
ISP
43h 38m
2 stops
$203Multiple Airlines
Sun, Apr 19 - Thu, Apr 23
Frontier Logo
8:31 pm - 1:09 am
ISP
-
ORD
29h 38m
1 stop
Frontier Logo
2:05 pm - 9:13 am
ORD
-
ISP
18h 08m
1 stop
$223Frontier
Fri, Apr 17 - Sun, Apr 19
Frontier Logo
8:31 pm - 10:37 am
ISP
-
ORD
15h 06m
1 stop
Frontier Logo
4:57 pm - 9:13 am
ORD
-
ISP
15h 16m
1 stop
$254Frontier
Thu, Apr 30 - Thu, May 7
Frontier Logo
4:07 pm - 1:15 pm
ISP
-
ORD
22h 08m
1 stop
Frontier Logo
5:30 pm - 10:05 am
ORD
-
ISP
15h 35m
1 stop
$259Frontier
Tue, Apr 28 - Tue, May 5
Southwest Logo
9:00 am - 3:15 pm
ISP
-
STL
7h 15m
1 stop
Southwest Logo
6:35 am - 11:55 am
STL
-
ISP
4h 20m
1 stop
$291Southwest
Tue, Apr 28 - Tue, May 5
Southwest Logo
6:30 am - 2:50 pm
ISP
-
STL
9h 20m
2 stops
Southwest Logo
6:35 am - 1:50 pm
STL
-
ISP
6h 15m
1 stop
$296Southwest
Tue, Apr 28 - Tue, May 5
Southwest Logo
6:30 am - 12:50 pm
ISP
-
STL
7h 20m
2 stops
Southwest Logo
5:35 am - 1:50 pm
STL
-
ISP
7h 15m
2 stops
$301Southwest
Fri, May 1 - Tue, May 5
Southwest Logo
5:10 pm - 11:40 pm
ISP
-
STL
7h 30m
1 stop
Southwest Logo
1:15 pm - 6:30 pm
STL
-
ISP
4h 15m
1 stop
$302Southwest
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 ($182) and Southwest ($296).

Good to know

Low seasonMay
Cheapest flight$78
Best time to beat the crowds with an average 44% drop in price.
Most popular time to fly and prices are also 8% 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 4344 reviews
8.6Crew
8.1Boarding
7.5Entertainment
7.0Food
8.0Comfort
Airline reviews

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

4.0 Okaysangeetha, Apr 2026
AUS - SJC
Read more Southwest reviews

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.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

Great flight. Good snacks and drinks. Grateful it was free. The flight from Nashville to louisville, i think her name was Tracy (not sure that's right) super awesome, nice and cheerful. She really enjoyed being at work today! She was the person who scanned the boarding pass on flight wn941. She should be recommended for a raise !

I liked it better when you were truer to your roots Am paying more for less fun

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

Information on your arrival and departure airports