$64 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 3/4. 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

Mon, Feb 23 - Sat, Feb 28
Frontier Logo
3:59 pm - 11:15 pm
ISP
-
ORD
8h 16m
1 stop
Frontier Logo
8:15 am - 7:28 pm
ORD
-
ISP
10h 13m
1 stop
$181Frontier
Mon, Feb 23 - Fri, Mar 6
Frontier Logo
3:59 pm - 11:15 pm
ISP
-
ORD
8h 16m
1 stop
Frontier Logo
8:39 pm - 9:48 am
ORD
-
ISP
12h 09m
1 stop
$195Frontier
Mon, Feb 23 - Fri, Feb 27
Frontier Logo
8:23 am - 11:15 pm
ISP
-
ORD
15h 52m
1 stop
Frontier Logo
3:11 pm - 7:28 pm
ORD
-
ISP
27h 17m
1 stop
$202Frontier
Sat, Mar 7 - Tue, Mar 10
Multiple Airlines Logo
10:43 am - 5:03 pm
ISP
-
ORD
7h 20m
1 stop
Multiple Airlines Logo
2:43 pm - 11:10 am
ORD
-
ISP
19h 27m
2 stops
$210Multiple Airlines
Wed, Feb 25 - Thu, Feb 26
Multiple Airlines Logo
9:33 am - 5:46 pm
ISP
-
ORD
9h 13m
1 stop
Multiple Airlines Logo
10:44 am - 7:38 am
ORD
-
ISP
19h 54m
1 stop
$241Multiple Airlines
Wed, Apr 22 - Tue, May 5
Southwest Logo
4:10 pm - 9:10 pm
ISP
-
STL
6h 00m
1 stop
Southwest Logo
6:35 am - 11:55 am
STL
-
ISP
4h 20m
1 stop
$243Southwest
Wed, Apr 22 - Tue, May 5
Southwest Logo
12:30 pm - 8:00 pm
ISP
-
STL
8h 30m
2 stops
Southwest Logo
6:35 am - 1:50 pm
STL
-
ISP
6h 15m
1 stop
$248Southwest
Wed, Apr 22 - Tue, May 5
Southwest Logo
12:30 pm - 8:00 pm
ISP
-
STL
8h 30m
2 stops
Southwest Logo
2:30 pm - 10:10 pm
STL
-
ISP
6h 40m
2 stops
$253Southwest
Mon, Feb 23 - Fri, Feb 27
Multiple Airlines Logo
3:59 pm - 5:46 pm
ISP
-
ORD
26h 47m
1 stop
Multiple Airlines Logo
3:40 pm - 11:06 am
ORD
-
ISP
18h 26m
2 stops
$256Multiple Airlines
Sat, Apr 18 - Sun, Apr 19
Southwest Logo
6:00 am - 10:00 am
ISP
-
STL
5h 00m
1 stop
Southwest Logo
6:00 am - 11:50 am
STL
-
ISP
4h 50m
1 stop
$291Southwest
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 ($181) and Southwest ($243).

Good to know

Low seasonApril
Cheapest flight$64
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 4280 reviews
8.0Comfort
8.6Crew
8.1Boarding
7.5Entertainment
7.0Food
Airline reviews

WiFi did not work. Boarding with the new seating assignments took too long. The temperature in the terminal was obnoxious. +/- 80°

2.0 MediocreMike, Feb 2026
LAS - OKC
Read more Southwest reviews

WiFi did not work. Boarding with the new seating assignments took too long. The temperature in the terminal was obnoxious. +/- 80°

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

My flight from Denver to Minneapolis was excellent. My flight from Minneapolis to Denver was one of the worst I flights I have ever experienced. I had a window seat, the gentleman in the middle seat was morbidly obese and SW should have made him purchase two seats. His elbow dug into my arm most of the way even after I asked to please be careful. I was literally squashed between the him and the window with no wiggle room. The plane was full so it was not possible to ask for a different seat. I realize I should have complained to the flight attendant but I didn't feel anything could be done to rectify the situation. I fly SW often, I will continue to do so as this was my first negative experience.

I was assigned seat 7E, yet my boarding was Group 5, which caused me to have to put my luggage in the back of the plance above `19 or 20 aisle, as passengers who had boarded earlier took the overhead bins in the front. SW needs to monitor bin space and ensure that bin space above the seat are aligned to those sitting near their seats. Also the seating assignments needs to align with group number. Maybe board those last first and so on? Having said the ALL the passengers on the plane were gracious enough to allow me and other passengers in this dilema to retrieve our luggage and helped us along the way. I always love the flight staff, as always their fantastic and I can't rave about them enough!

I appreciate the staff who allowed me to board though I arrived a little late! Regarding the assigned seating, I had booked my flight before this change and wasn't aware of the change at the time, and so I didn't select a seat at booking as I didn't realize it was relevant. Better communication about the change would have been helpful for preparing.

Flight attendants very hospitable and friendly. Pilot flew a smooth take off and landing.

Paid for premium extra leg room but the bin space for rows 1-3 had to go in rows 4-6 and 4-6 had to go to 7-9 because flight attendants have snacks and their luggage upfront. So we pay extra to have to fight thru traffic to get our bags. Only 2nd day of new seating so hope they fix this.

WIFI was great. My selection for seating is an aisle, but during my trip, I never had an aisle seat. If we can get that corrected, I will be thrilled. No snack or drink on this flight.

WIFI was great. My selection for seating is an aisle, but during my trip, I never had an aisle seat. If we can get that corrected, I will be thrilled.

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

Information on your arrival and departure airports