$80 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 4/9. 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

Fri, Apr 17 - Sun, Apr 19
Frontier Logo
4:07 pm - 3:23 pm
ISP
-
ORD
24h 16m
1 stop
Frontier Logo
4:57 pm - 9:13 am
ORD
-
ISP
15h 16m
1 stop
$215Frontier
Thu, Jun 4 - Sun, Jun 7
Frontier Logo
10:03 am - 11:41 pm
ISP
-
ORD
14h 38m
1 stop
Frontier Logo
7:00 am - 2:34 pm
ORD
-
ISP
6h 34m
1 stop
$236Frontier
Fri, May 8 - Fri, May 15
Multiple Airlines Logo
4:07 pm - 11:07 pm
ISP
-
ORD
8h 00m
1 stop
Multiple Airlines Logo
1:12 pm - 11:17 am
ORD
-
ISP
21h 05m
1 stop
$251Multiple Airlines
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
$256Frontier
Thu, Apr 16 - Mon, Apr 20
Southwest Logo
5:10 pm - 11:40 pm
ISP
-
STL
7h 30m
1 stop
Southwest Logo
4:00 pm - 11:30 pm
STL
-
ISP
6h 30m
1 stop
$271Southwest
Thu, Apr 16 - Mon, Apr 20
Southwest Logo
5:10 pm - 11:40 pm
ISP
-
STL
7h 30m
1 stop
Southwest Logo
2:10 pm - 11:30 pm
STL
-
ISP
8h 20m
2 stops
$276Southwest
Fri, May 8 - Fri, May 15
Multiple Airlines Logo
4:07 pm - 11:07 pm
ISP
-
ORD
8h 00m
1 stop
Multiple Airlines Logo
10:31 am - 11:17 am
ORD
-
ISP
23h 46m
2 stops
$282Multiple Airlines
Wed, Apr 8 - Wed, Apr 15
Frontier Logo
8:00 am - 12:24 pm
ISP
-
ORD
29h 24m
1 stop
Frontier Logo
6:08 pm - 9:13 am
ORD
-
ISP
38h 05m
2 stops
$284Frontier
Mon, Mar 30 - Mon, Apr 6
Southwest Logo
5:55 pm - 11:05 pm
ISP
-
STL
6h 10m
1 stop
Southwest Logo
5:20 am - 11:40 am
STL
-
ISP
5h 20m
1 stop
$314Southwest
Thu, Apr 23 - Mon, Apr 27
Southwest Logo
4:30 pm - 11:40 pm
ISP
-
STL
8h 10m
2 stops
Southwest Logo
4:00 pm - 11:30 pm
STL
-
ISP
6h 30m
1 stop
$319Southwest
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 ($276).

Find deals

Good to know

Low seasonMay
Cheapest flight$80
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly with an average 4% 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 4317 reviews
7.5Entertainment
8.6Crew
7.0Food
8.1Boarding
8.0Comfort
Airline reviews

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

4.0 OkayKenny, Mar 2026
TPA - BWI
Read more Southwest reviews

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

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

I realize they are still working out kinks with the new boarding process, but by the time I boarded in group 5, most of the bins were full. All airlines should better enforce small bags and jackets going under the seats until everyone has boarded.

WiFi was not working and didn’t have a beverage service

Snacks are always pretzels. Why can't you also offer peanuts ?

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

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

Information on your arrival and departure airports

Islip (ISP)