$75 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 11/20. 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

Wed, Nov 5 - Sun, Nov 9
Frontier Logo
4:58 pm - 12:26 pmISP-ORD
20h 28m1 stop
Frontier Logo
7:05 am - 9:09 amORD-ISP
25h 04m1 stop
$210Frontier
Find Deal
Fri, Nov 7 - Mon, Nov 10
Frontier Logo
9:39 am - 5:10 pmISP-ORD
8h 31m1 stop
Frontier Logo
5:15 am - 7:06 pmORD-ISP
12h 51m1 stop
$228Frontier
Find Deal
Sat, Nov 8 - Tue, Nov 11
Multiple Airlines Logo
8:45 pm - 1:03 pmISP-ORD
17h 18m1 stop
Multiple Airlines Logo
6:48 am - 10:37 amORD-ISP
26h 49m1 stop
$241Multiple Airlines
Find Deal
Thu, Dec 4 - Tue, Dec 9
Multiple Airlines Logo
10:19 am - 9:19 pmISP-ORD
12h 00m1 stop
Multiple Airlines Logo
4:22 pm - 9:13 amORD-ISP
39h 51m2 stops
$247Multiple Airlines
Find Deal
Thu, Nov 20 - Sat, Nov 22
Multiple Airlines Logo
10:02 am - 5:11 pmISP-ORD
8h 09m1 stop
Multiple Airlines Logo
8:20 am - 10:09 amORD-ISP
24h 49m2 stops
$252Multiple Airlines
Find Deal
Wed, Nov 12 - Wed, Dec 10
Southwest Logo
3:55 pm - 10:00 pmISP-STL
7h 05m1 stop
Southwest Logo
5:10 am - 12:30 pmSTL-ISP
6h 20m1 stop
$259Southwest
Find Deal
Wed, Nov 12 - Wed, Dec 10
Southwest Logo
5:40 am - 12:35 pmISP-STL
7h 55m2 stops
Southwest Logo
9:40 am - 3:20 pmSTL-ISP
4h 40m1 stop
$265Southwest
Find Deal
Wed, Nov 12 - Wed, Dec 10
Southwest Logo
5:40 am - 1:50 pmISP-STL
9h 10m2 stops
Southwest Logo
7:00 am - 3:20 pmSTL-ISP
7h 20m2 stops
$279Southwest
Find Deal
Fri, Nov 14 - Mon, Nov 17
Frontier Logo
4:58 pm - 3:38 pmISP-STL
23h 40m1 stop
Frontier Logo
2:12 pm - 5:42 pmSTL-ISP
26h 30m1 stop
$281Frontier
Find Deal
Fri, Nov 14 - Mon, Nov 17
Southwest Logo
1:40 pm - 8:55 pmISP-STL
8h 15m2 stops
Southwest Logo
5:10 am - 3:05 pmSTL-ISP
8h 55m2 stops
$370Southwest
Find Deal
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 fly non-stop between Islip and Illinois?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Islip to Illinois.

There is just one airline that flies from Islip to Illinois direct and that is Southwest. The best round-trip deal found from Southwest for the route is to Chicago Midway Airport (MDW) and costs $306.

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 ($210) and Southwest ($259).

Good to know

Low seasonApril
Cheapest flight$75
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly and prices are also 13% 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.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally in the afternoon, when round-trip flights cost $259 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the evening, which is peak travel time and where the average cost of a ticket is $305.

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 4237 reviews
7.5Entertainment
8.0Comfort
8.1Boarding
7.0Food
8.6Crew
Airline reviews

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

10.0 ExcellentStacy, Oct 2025SMF - DEN
Read more Southwest reviews

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

mandatory demand customer to check their carry on because not enough people check bags.

Connecting flight is on time and boarding was a breeze!

Excellent. Would encourage Southwest to keep current boarding procedures with free style seating. Makes for a fantastic experience

As always, the entire Southwest experience was perfect. Purchasing the tickets on the Southwest web site was effortless, departure and arrival gates were spotless and comfortable, plane was clean and comfortable, crew was excellent and flight was on time. Wheelchair service in Las Vegas at departure was somewhat chaotic and disjointed, but I am not sure if that was Southwest problem, airport problem or combination.

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

Information on your arrival and departure airports

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