$81 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 10/20. 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

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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Best Illinois Flight Deals from Islip

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
St. Louis
St. Louis1 stop$184
St. Louis
St. Louis1 stop$184

Cheap Flights from Islip to Illinois

 
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, Aug 29 - Tue, Sep 2
Southwest Logo
6:00 am - 11:30 amISP-STL
6h 30m1 stop
Southwest Logo
7:00 am - 11:55 amSTL-ISP
3h 55m1 stop
$184Southwest
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Fri, Aug 29 - Tue, Sep 2
Southwest Logo
6:00 am - 11:30 amISP-STL
6h 30m1 stop
Southwest Logo
5:25 am - 3:15 pmSTL-ISP
8h 50m2 stops
$189Southwest
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Thu, Oct 2 - Sat, Oct 4
Southwest Logo
5:55 am - 11:50 amISP-ORD
6h 55m1 stop
Southwest Logo
6:00 am - 4:15 pmORD-ISP
9h 15m2 stops
$194Southwest
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Thu, Oct 2 - Sat, Oct 4
Southwest Logo
5:55 am - 4:25 pmISP-ORD
11h 30m2 stops
Southwest Logo
6:00 am - 4:15 pmORD-ISP
9h 15m2 stops
$199Southwest
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Sat, Aug 23 - Mon, Aug 25
Southwest Logo
5:40 am - 11:50 amISP-ORD
7h 10m1 stop
Southwest Logo
2:55 pm - 10:55 pmORD-ISP
7h 00m2 stops
$204Southwest
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Fri, Aug 1 - Sat, Aug 2
Frontier Logo
2:05 pm - 12:25 amISP-ORD
11h 20m1 stop
Frontier Logo
9:08 am - 7:42 pmORD-ISP
9h 34m1 stop
$245Frontier
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Mon, Jul 21 - Wed, Jul 23
Frontier Logo
2:05 pm - 12:25 amISP-ORD
11h 20m1 stop
Frontier Logo
11:28 am - 7:52 pmORD-ISP
7h 24m1 stop
$264Frontier
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Fri, Aug 1 - Tue, Aug 5
Frontier Logo
2:05 pm - 12:25 amISP-ORD
11h 20m1 stop
Frontier Logo
11:28 am - 9:58 pmORD-ISP
9h 30m1 stop
$268Frontier
Find Deal
Fri, Aug 22 - Sat, Aug 30
Breeze Airways Logo
10:36 am - 8:45 amISP-SPI
23h 09m2 stops
Breeze Airways Logo
9:25 am - 9:56 amSPI-ISP
47h 31m2 stops
$1,028Breeze Airways
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Fri, Aug 22 - Sat, Aug 30
Breeze Airways Logo
10:36 am - 8:45 amISP-SPI
23h 09m2 stops
Breeze Airways Logo
9:25 am - 6:59 pmSPI-ISP
32h 34m3 stops
$1,052Breeze Airways
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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 ($184) and Frontier ($245).

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Good to know

Low seasonApril
High seasonJuly
Cheapest flight$81
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 39% 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.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally in the afternoon, when round-trip flights cost $259 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the evening, which is peak travel time and where the average cost of a ticket is $305.

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 4252 reviews
7.0Food
8.6Crew
7.6Entertainment
8.1Boarding
8.0Comfort
Airline reviews

It was one and half hour late... Not sure if any other experience matters.

4.0 OkaySudhir, Jul 2025LGA - MCI
Read more Southwest reviews

It was one and half hour late... Not sure if any other experience matters.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

For my birthday trip this was my second time ever flying, this trip was the best.

after landing, we stay 2 hours on the taxi way before reaching the gate The airline and the crew were good though

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Sat on tarmac for 2 hours and then missed my connecting flight

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

Everything was on time. I was disappointed by the front section female, African American flight attendant. I did not see her name tag or would have identified by name not race. As passengers moved to the bathroom early in flight, she would say with a disdainful tone “I have to say the seat belt light is on” then go back to her book. Better trained flight attendants say something like be careful the seat belt light is on.

Cluster mess boarding. Can't wait for SWA reserved seating. Internet didn't seem to work on the plane.

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

Information on your arrival and departure airports

Islip (ISP)

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