$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 9/15. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
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

Tue, Sep 1 - Wed, Sep 2
Frontier Logo
10:57 am - 11:08 pm
ISP
-
ORD
13h 11m
1 stop
Frontier Logo
7:44 pm - 9:53 am
ORD
-
ISP
13h 09m
1 stop
$258Frontier
Mon, Aug 24 - Mon, Aug 31
Frontier Logo
7:09 pm - 11:08 pm
ISP
-
ORD
28h 59m
1 stop
Frontier Logo
6:05 am - 9:53 am
ORD
-
ISP
26h 48m
1 stop
$260Frontier
Fri, Aug 28 - Mon, Aug 31
Frontier Logo
10:57 am - 11:08 pm
ISP
-
ORD
13h 11m
1 stop
Frontier Logo
6:05 am - 6:14 pm
ORD
-
ISP
11h 09m
1 stop
$263Frontier
Thu, Sep 3 - Fri, Sep 4
Frontier Logo
10:57 am - 11:08 pm
ISP
-
ORD
13h 11m
1 stop
Frontier Logo
9:10 pm - 6:14 pm
ORD
-
ISP
20h 04m
1 stop
$268Frontier
Fri, Aug 21 - Mon, Aug 24
Frontier Logo
10:57 am - 11:08 pm
ISP
-
ORD
13h 11m
1 stop
Frontier Logo
6:05 am - 6:14 pm
ORD
-
ISP
11h 09m
1 stop
$273Frontier
Tue, Jul 28 - Thu, Jul 30
Southwest Logo
6:00 am - 11:30 am
ISP
-
STL
6h 30m
1 stop
Southwest Logo
8:10 pm - 8:20 am
STL
-
ISP
11h 10m
1 stop
$285Southwest
Wed, Aug 12 - Wed, Aug 19
Frontier Logo
10:57 am - 11:10 pm
ISP
-
ORD
13h 13m
1 stop
Frontier Logo
5:59 pm - 9:53 am
ORD
-
ISP
14h 54m
1 stop
$288Frontier
Wed, Aug 12 - Wed, Aug 19
Frontier Logo
10:57 am - 11:10 pm
ISP
-
ORD
13h 13m
1 stop
Frontier Logo
5:59 pm - 6:14 pm
ORD
-
ISP
23h 15m
1 stop
$292Frontier
Fri, Aug 14 - Sun, Aug 16
Frontier Logo
10:57 am - 11:10 pm
ISP
-
ORD
13h 13m
1 stop
Frontier Logo
5:13 pm - 9:53 am
ORD
-
ISP
15h 40m
1 stop
$297Frontier
Tue, Jul 28 - Thu, Jul 30
Southwest Logo
2:55 pm - 10:30 pm
ISP
-
STL
8h 35m
2 stops
Southwest Logo
4:25 pm - 11:40 pm
STL
-
ISP
6h 15m
2 stops
$338Southwest
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 39% drop in price.
Most popular time to fly and prices are also 16% 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 4247 reviews
7.5Entertainment
8.1Boarding
7.0Food
8.0Comfort
8.6Crew
Airline reviews

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

2.0 MediocreMatthew, Jun 2026
CVG - MDW
Read more Southwest reviews

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

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

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

no service at all due to turbulence. they should've at least given us snacks, there were only 10 people on the entire flight.

For the first time in a long time, the Wi-Fi actually worked the entire flight! The flight crew was amazing as usual.

Great flight. I didn't get a drink because I was asleep whole on the flight.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

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

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

My bag was damaged and is now missing a wheel. I tried to buy a claim in on the website but it would not accept my confirmation # for submission. Other than that, everything else was good!

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

Information on your arrival and departure airports

Islip (ISP)