$70 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 4/16. 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

Thu, Apr 16 - Sat, Apr 25
Frontier Logo
4:07 pm - 11:19 pm
ISP
-
STL
8h 12m
1 stop
Frontier Logo
4:59 pm - 9:13 am
STL
-
ISP
15h 14m
1 stop
$140Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
11:00 am - 11:13 pm
ISP
-
ORD
13h 13m
1 stop
Frontier Logo
5:30 pm - 3:56 pm
ORD
-
ISP
21h 26m
1 stop
$166Frontier
Fri, Apr 24 - Sun, Apr 26
Frontier Logo
4:07 pm - 3:23 pm
ISP
-
ORD
24h 16m
1 stop
Frontier Logo
6:00 am - 9:28 am
ORD
-
ISP
26h 28m
1 stop
$180Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
11:00 am - 11:13 pm
ISP
-
ORD
13h 13m
1 stop
Frontier Logo
6:55 am - 3:56 pm
ORD
-
ISP
32h 01m
2 stops
$189Frontier
Sun, Apr 26 - Sun, May 3
Frontier Logo
8:35 pm - 11:58 pm
ISP
-
ORD
28h 23m
1 stop
Frontier Logo
6:00 am - 9:13 am
ORD
-
ISP
26h 13m
1 stop
$201Frontier
Fri, May 1 - Tue, May 5
Southwest Logo
8:35 am - 1:50 pm
ISP
-
STL
6h 15m
1 stop
Southwest Logo
6:35 am - 11:55 am
STL
-
ISP
4h 20m
1 stop
$247Southwest
Tue, Apr 14 - Mon, Apr 20
Southwest Logo
4:10 pm - 9:05 pm
ISP
-
STL
5h 55m
1 stop
Southwest Logo
4:00 pm - 11:30 pm
STL
-
ISP
6h 30m
1 stop
$248Southwest
Tue, Apr 14 - Mon, Apr 20
Southwest Logo
4:10 pm - 10:10 pm
ISP
-
STL
7h 00m
2 stops
Southwest Logo
4:00 pm - 11:30 pm
STL
-
ISP
6h 30m
1 stop
$253Southwest
Fri, May 1 - Tue, May 5
Southwest Logo
4:30 pm - 11:40 pm
ISP
-
STL
8h 10m
2 stops
Southwest Logo
2:30 pm - 10:10 pm
STL
-
ISP
6h 40m
2 stops
$258Southwest
Sun, Apr 26 - Sun, May 3
Multiple Airlines Logo
8:35 pm - 6:20 pm
ISP
-
ORD
22h 45m
1 stop
Multiple Airlines Logo
11:28 am - 11:00 am
ORD
-
ISP
46h 32m
2 stops
$275Multiple Airlines
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 Southwest ($247) and Frontier ($382).

Good to know

Low seasonMay
Cheapest flight$70
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 St. Louis

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
7.0Food
7.5Entertainment
Airline reviews

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.

2.0 MediocreStuart, Mar 2026
HOU - STL
Read more Southwest reviews

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

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

Boarding was easy. The seats are small and fairly uncomfortable

I was supposed to be on a later flight. When I showed up at the gate, the woman working there was extremely helpful getting moved up to this earlier flight.

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

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

Information on your arrival and departure airports