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$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 5/20. 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

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$191

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.

Recent round-trip flight deals from Islip to Illinois

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Islip to Illinois.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Frontier Logo
7:15 pm - 11:32 pmISP-ORD
29h 17m1 stop
Frontier Logo
4:15 pm - 10:12 amORD-ISP
16h 57m1 stop
$181Frontier
Find Deal
Wed, May 7 - Sat, May 10
Frontier Logo
6:48 pm - 12:14 amISP-STL
6h 26m1 stop
Frontier Logo
5:45 pm - 10:12 amSTL-ISP
15h 27m1 stop
$191Frontier
Find Deal
Fri, May 2 - Wed, May 7
Frontier Logo
7:15 pm - 11:32 pmISP-ORD
29h 17m1 stop
Frontier Logo
4:15 pm - 10:12 amORD-ISP
16h 57m1 stop
$191Frontier
Find Deal
Wed, May 7 - Sun, May 11
Frontier Logo
8:21 pm - 8:22 amISP-ORD
13h 01m1 stop
Frontier Logo
1:02 pm - 8:42 pmORD-ISP
6h 40m1 stop
$198Frontier
Find Deal
Wed, May 28 - Sat, May 31
JetBlue Logo
6:00 am - 10:08 amISP-ORD
5h 08m1 stop
JetBlue Logo
10:50 am - 9:28 pmORD-ISP
9h 38m1 stop
$313JetBlue
Find Deal
Sat, May 31 - Sat, Jun 7
Logo
11:02 am - 12:05 amISP-ORD
14h 03m1 stop
Logo
5:05 am - 7:17 pmORD-ISP
13h 12m1 stop
$314
Find Deal
Sun, May 18 - Tue, May 20
Southwest Logo
6:00 am - 12:45 pmISP-ORD
7h 45m1 stop
Southwest Logo
1:30 pm - 9:40 pmORD-ISP
7h 10m1 stop
$324Southwest
Find Deal
Thu, Aug 7 - Sat, Aug 16
Southwest Logo
5:55 am - 11:50 amISP-ORD
6h 55m1 stop
Southwest Logo
11:25 am - 10:10 pmORD-ISP
9h 45m1 stop
$340Southwest
Find Deal
Thu, Oct 2 - Mon, Oct 6
JetBlue Logo
6:00 am - 10:02 amISP-ORD
5h 02m1 stop
JetBlue Logo
8:45 am - 9:28 pmORD-ISP
11h 43m1 stop
$449JetBlue
Find Deal
Wed, May 21 - Thu, May 22
Logo
11:02 am - 11:29 pmISP-ORD
13h 27m2 stops
Logo
5:05 am - 7:17 pmORD-ISP
13h 12m1 stop
$509
Find Deal
Sun, May 18 - Tue, May 20

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 time of day to fly to Illinois?

The average price for all round-trip flights from Islip to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.
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.
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Good to know

Low season

April

High season

July

Cheapest flight

$96
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 40% 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.

See more FAQs

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 4286 reviews
8.2Boarding
7.1Food
8.0Comfort
7.6Entertainment
8.6Crew
Airline reviews

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

8.0 ExcellentJonathan, Apr 2025AUS - MSY
Read more Southwest reviews

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.

Plz don't take away free bags and free seating

The seats were a bit cramped and worn, but otherwise okay.

I would have liked to arrive on time - not 5 hours late!

After a 3 hour layover in Denver my flight was delayed over 5 hours! No explanation; no assistance; no offer to provide compensation; no one at Southwest was willing to offer any assistance. 8 hours in the Denver airport - ridiculous!

It was a perfect flight in all aspects! Both legs!

Only one drink pass through the cabin for a 4 hour flight. Quite rough and bumpy landing.

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

1.5 hour delay, poor service, no compassion from the crew. Terrible experience

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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