$129 Find Cheap Flights from Islip to Illinois - Compare and Save

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 10/3. 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

Fri, Jul 24 - Fri, Jul 31
Frontier Logo
10:57 am - 11:59 pm
ISP
-
STL
14h 02m
1 stop
Frontier Logo
4:09 pm - 9:53 am
STL
-
ISP
16h 44m
1 stop
$285Frontier
Sun, Aug 23 - Mon, Aug 31
Southwest Logo
6:20 am - 11:50 am
ISP
-
STL
6h 30m
1 stop
Southwest Logo
6:05 am - 12:35 pm
STL
-
ISP
5h 30m
1 stop
$295Southwest
Thu, Jul 9 - Wed, Jul 15
Southwest Logo
6:00 pm - 11:15 pm
ISP
-
STL
6h 15m
1 stop
Southwest Logo
6:55 am - 1:45 pm
STL
-
ISP
5h 50m
1 stop
$296Southwest
Sun, Aug 23 - Mon, Aug 31
Southwest Logo
6:10 pm - 11:25 pm
ISP
-
STL
6h 15m
1 stop
Southwest Logo
12:55 pm - 10:05 pm
STL
-
ISP
8h 10m
2 stops
$300Southwest
Thu, Jul 9 - Wed, Jul 15
Southwest Logo
6:00 pm - 12:40 am
ISP
-
STL
7h 40m
2 stops
Southwest Logo
6:55 am - 1:45 pm
STL
-
ISP
5h 50m
1 stop
$301Southwest
Sun, Aug 23 - Mon, Aug 31
Southwest Logo
6:20 am - 3:50 pm
ISP
-
STL
10h 30m
2 stops
Southwest Logo
2:45 pm - 10:05 pm
STL
-
ISP
6h 20m
2 stops
$311Southwest
Fri, Jul 10 - Mon, Jul 13
Southwest Logo
3:05 pm - 8:20 pm
ISP
-
STL
6h 15m
1 stop
Southwest Logo
4:30 pm - 11:45 pm
STL
-
ISP
6h 15m
1 stop
$313Southwest
Fri, Nov 6 - Mon, Nov 9
Frontier Logo
3:43 pm - 11:50 pm
ISP
-
ORD
9h 07m
1 stop
Frontier Logo
4:44 pm - 2:33 pm
ORD
-
ISP
20h 49m
1 stop
$318Frontier
Fri, Jul 10 - Mon, Jul 13
Southwest Logo
3:05 pm - 8:50 pm
ISP
-
STL
6h 45m
2 stops
Southwest Logo
4:30 pm - 11:45 pm
STL
-
ISP
6h 15m
1 stop
$318Southwest
Tue, Aug 25 - Thu, Aug 27
JetBlue Logo
6:00 am - 1:39 pm
ISP
-
ORD
8h 39m
1 stop
JetBlue Logo
2:35 pm - 10:56 pm
ORD
-
ISP
7h 21m
1 stop
$356JetBlue
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.

What is the cheapest month to fly from Islip to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Islip to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Islip to Illinois is February, when tickets cost $0 (return) on average. On the other hand, the most expensive months are March and January, when the average cost of round-trip tickets is $936 and $373 respectively.

Find deals

Good to know

Low seasonNovember
Cheapest flight$129
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly and prices are also 14% 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.
7.9
SouthwestOverall score based on 4235 reviews
8.0Comfort
7.0Food
8.6Crew
7.5Entertainment
8.1Boarding
Airline reviews

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

10.0 ExcellentAnonymous, Jun 2026
OKC - LAS
Read more Southwest reviews

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

OKay. I sat in the back of the plane and it was really loud between babies and little kids, and adults who.like to talk a lot and loudly most of the flight.

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Was fine, delayed and feels like southwest is always late

I don't know why flying out of Sarasota requires two plane changes.

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

The flight was smooth. The Southwest experience has degraded overall, but this one was okay.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

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

Information on your arrival and departure airports

Islip (ISP)