$96 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 5/18. 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

Tue, May 26 - Tue, Jun 2
Frontier Logo
6:02 pm - 11:57 pm
ISP
-
STL
6h 55m
1 stop
Frontier Logo
4:19 pm - 10:05 am
STL
-
ISP
16h 46m
1 stop
$160Frontier
Tue, May 26 - Tue, Jun 2
Frontier Logo
6:02 pm - 11:13 pm
ISP
-
ORD
30h 11m
1 stop
Frontier Logo
1:50 pm - 10:05 am
ORD
-
ISP
19h 15m
2 stops
$200Frontier
Sat, May 30 - Tue, Jun 2
Frontier Logo
11:00 am - 11:13 pm
ISP
-
ORD
13h 13m
1 stop
Frontier Logo
5:11 pm - 10:05 am
ORD
-
ISP
15h 54m
1 stop
$222Frontier
Tue, May 26 - Tue, Jun 2
Multiple Airlines Logo
6:02 pm - 11:13 pm
ISP
-
ORD
30h 11m
1 stop
Multiple Airlines Logo
10:54 am - 10:05 am
ORD
-
ISP
22h 11m
1 stop
$236Multiple Airlines
Sat, May 9 - Fri, May 15
Frontier Logo
11:00 am - 11:13 pm
ISP
-
ORD
13h 13m
1 stop
Frontier Logo
5:30 pm - 10:05 am
ORD
-
ISP
15h 35m
1 stop
$239Frontier
Thu, May 28 - Mon, Jun 8
Frontier Logo
11:00 am - 11:57 pm
ISP
-
STL
13h 57m
1 stop
Frontier Logo
4:19 pm - 3:56 pm
STL
-
ISP
22h 37m
1 stop
$243Frontier
Tue, May 26 - Tue, Jun 2
Frontier Logo
6:02 pm - 6:06 pm
ISP
-
STL
25h 04m
2 stops
Frontier Logo
4:19 pm - 10:05 am
STL
-
ISP
16h 46m
1 stop
$249Frontier
Tue, Jul 7 - Fri, Jul 10
Frontier Logo
4:41 pm - 11:05 pm
ISP
-
ORD
7h 24m
1 stop
Frontier Logo
10:16 am - 9:58 am
ORD
-
ISP
22h 42m
1 stop
$250Frontier
Thu, May 28 - Mon, Jun 8
Frontier Logo
11:00 am - 11:57 pm
ISP
-
STL
13h 57m
1 stop
Frontier Logo
5:27 pm - 10:03 am
STL
-
ISP
39h 36m
2 stops
$257Frontier
Fri, Jun 5 - Sun, Jun 7
Multiple Airlines Logo
11:00 am - 8:55 am
ISP
-
STL
22h 55m
2 stops
Multiple Airlines Logo
4:19 pm - 10:05 am
STL
-
ISP
16h 46m
1 stop
$332Multiple 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.

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 July, when the average cost of round-trip tickets is $936 and $386 respectively.

Good to know

Low seasonMay
Cheapest flight$96
Best time to beat the crowds with an average 40% drop in price.
Most popular time to fly and prices are also 9% 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.
8.0
SouthwestOverall score based on 4314 reviews
7.5Entertainment
7.0Food
8.6Crew
8.1Boarding
8.0Comfort
Airline reviews

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

10.0 Excellentlarry, Apr 2026
LGB - PHX
Read more Southwest reviews

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

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

First time I've had to use the disabled accommodations. And I could not have had a better experience with Southwest, i was having trouble getting from one terminal to another due to my heart failure. And the next thing I know a Southwest agent had made sure. I had a wheelchair at all my flights. Can't thank them enough.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

We waited in the airplane for over 45 min for a southwest employee to make the flight. This cause over half the plane to miss their connecting flight in Denver. When we confronted the desk upon arrival, they told us the only flight they had was the next day leaving at 8:50 pm!!! Or they offered to get us to Burbank or LA, but after that we were on our own to get back to Santa Barbara. I paid for a flight from sba to bna bna to sba. My re entry into mom mode has been 💯 rough because of southwest mistake with my flight. And now I’m leaving to Reno tomorrow for a vballl tournament and just discovered that my leg in Vegas has me and my 3 kids on a stand by flight even though I had booked these ticket last year November!! Do better southwest!

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

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

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

Information on your arrival and departure airports