$74 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 3/3. 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
0 bags

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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
In the last 7 days travelers have searched 41,299,237 times on KAYAK, and here is why:

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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$118

Good to know

Cheapest flight

$74
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.

See more FAQs

Top tips for finding cheap flights to Illinois

  • High season is considered to be January, February and December. The cheapest month to fly from Islip is January.
  • Morning departure is around 26% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

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.
6.1
FrontierOverall score based on 3480 reviews
4.7Entertainment
4.9Food
5.7Comfort
6.4Boarding
6.9Crew
Airline reviews

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

4.0 OkayAnonymous, Dec 2024ONT - LAS
Read more Frontier reviews

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

terrible cascading delays and unhelpful customer service. uncomfortable plane. crew was great, however!

I ended up paying $70+ dollars to for a carryon because the website is confusing and misleading. I now realize I did not need to pay that. I request a refund. I will pay extra to other airlines and not fly Frontier again.

With frontier you get what you pay for. The flight was two hours late. It’s a tight fit for the number of people they bring but you get to where you’re going cheap. Sometimes that’s more important than a nifty drink and cool TV..

Charges unexpected. For seat that didnt recline. Please reverse extra seat and carryon charge. Bad business that is a bait and switch.

Although we received an email from Kayak AND the airline, turns out we were not on Frontier’s manifest for the flight. We had to purchase tickets at the gate. Not sure where this transaction fell apart, but it did. We are now disputing the charges for the SLC to PDX flight originally booked through Kayak.

We had an awful experience getting our bags checked in. Frontier’s check in on the app manipulated us into buying the business package because that was the only option available for a checked bag which included two checked bags per person which we did not need. Upon arriving to the airport, we stood in line for what seemed like forever at the baggage check in and there was no one available at the counter. We were first in line and we were afraid we were going to miss our flight due to the baggage attendant being late. After realizing there were a lot of other people waiting at the baggage check in and no one available. I reached out to Frontier and could not get any customer service so I had to call the airport to page the baggage attendant to send someone to the counter to check in our bags before we were able to go through security , I finally spoke to the attendant at the counter and explained to her that we had to pay for two checked bags person a total of six bags when we only had a total of three bags between three people she said to reach out to Frontier and they would issue a refund for the three bags that we paid for and did not need. I reached out to Frontier which I was not able to reach anybody by phone so I had to go through their automated chat feature, which sent me around in circles until I finally reached a representative to assist me. I explained to them what happened and they explained that they were not able to assist me. I continued to push the issue with them as this was very frustrating and they finally put in a customer service ticket where we were issued a flight credit and we were so disappointed because after this experience, we NEVER want to fly Frontier again, and we do not want a credit that we will not use. Frontier charged us almost $500 for us to check three bags which is absolutely absurd! The customer service agents were not able to offer anything else other than a flight credit and I do not feel like my frustrations were truly heard , we will never use Frontier Airlines again ! Truly Theft by Manipulation! They should be ashamed!

I couldn’t check in because the app didn’t work. It took 3 Frontier employees at the counter to get me checked in. Flight left 3 hours after departure time

One crew member was rude about our bags. Be nice about it. We don’t fly a lot. And the fact that you have to pay for a carry on is ridiculous

While booking it was not obvious that I had to pay for carryon. Realized it only during check-in. Overall, meh!

Book cheap flights from Islip to Illinois

Recent round-trip flight deals

 
These are the cheapest round-trip flights from Islip to Illinois found on KAYAK in the last 72 hours.
1/7Tue
1 stopFrontier
15h 47mISP-STL
1/8Wed
1 stopFrontier
24h 57mSTL-ISP
$118
1/15Wed
1 stopFrontier
23h 25mISP-ORD
1/17Fri
1 stopFrontier
12h 41mORD-ISP
$124
2/20Thu
1 stopFrontier
12h 33mISP-ORD
2/24Mon
1 stopFrontier
12h 33mORD-ISP
$152
1/10Fri
1 stopFrontier
9h 13mISP-ORD
1/12Sun
1 stopFrontier
22h 38mORD-ISP
$158
3/1Sat
1 stopFrontier
10h 36mISP-ORD
3/4Tue
1 stopFrontier
6h 49mORD-ISP
$184
3/2Sun
1 stopFrontier
12h 33mISP-ORD
3/4Tue
1 stopFrontier
6h 49mORD-ISP
$194
1/22Wed
1 stop
15h 14mISP-ORD
1/31Fri
2 stops
9h 50mORD-ISP
$332
1/15Wed
1 stopSouthwest
9h 45mISP-ORD
1/22Wed
1 stopSouthwest
4h 10mORD-ISP
$334
1/15Wed
1 stopSouthwest
8h 50mISP-ORD
1/22Wed
2 stopsSouthwest
15h 00mORD-ISP
$339
1/15Wed
2 stopsSouthwest
11h 35mISP-ORD
1/22Wed
2 stopsSouthwest
9h 50mORD-ISP
$344

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Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Islip to Illinois found on KAYAK in the last 72 hours.
3/3Mon
1 stopFrontier
7h 56mISP-ORD
$74
2/28Fri
1 stopFrontier
7h 46mISP-ORD
$133
12/31Tue
1 stopFrontier
13h 03mISP-STL
$160
12/23Mon
1 stopFrontier
13h 50mISP-ORD
$225
12/23Mon
2 stopsSouthwest
12h 00mISP-ORD
$323
12/24Tue
1 stopFrontier
12h 59mISP-ORD
$325
1/2Thu
1 stopFrontier
7h 53mISP-ORD
$374
12/22Sun
1 stopFrontier
7h 58mISP-ORD
$384
12/23Mon
1 stopFrontier
13h 50mISP-ORD
$395
12/23Mon
3 stops
18h 05mISP-ORD
$633

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Last minute flights from Islip to Illinois

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Islip to Illinois that are departing in the next 10 days.
12/19Thu
multi-stopFrontier
7h 53mISP-ORD
12/31Tue
multi-stopFrontier
7h 09mORD-ISP
$496
12/21Sat
multi-stopFrontier
8h 49mISP-ORD
12/27Fri
multi-stopFrontier
12h 14mORD-ISP
$553
12/22Sun
multi-stopFrontier
7h 58mISP-ORD
12/31Tue
multi-stopFrontier
7h 09mORD-ISP
$565
12/21Sat
multi-stopFrontier
8h 49mISP-ORD
1/4Sat
multi-stopFrontier
9h 19mORD-ISP
$593
12/22Sun
multi-stopFrontier
13h 16mISP-ORD
12/29Sun
multi-stopFrontier
11h 21mORD-ISP
$623
12/20Fri
multi-stopFrontier
13h 16mISP-ORD
12/22Sun
multi-stopFrontier
8h 14mORD-ISP
$668
12/21Sat
multi-stopSouthwest
8h 55mISP-ORD
12/27Fri
multi-stopSouthwest
6h 55mORD-ISP
$836
12/21Sat
multi-stopSouthwest
8h 55mISP-ORD
12/27Fri
multi-stopSouthwest
8h 00mORD-ISP
$841
12/20Fri
multi-stopSouthwest
7h 45mISP-ORD
12/22Sun
multi-stopSouthwest
8h 00mORD-ISP
$881
12/20Fri
multi-stop
25h 29mISP-ORD
12/22Sun
multi-stop
25h 25mORD-ISP
$1,083

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

Information on your arrival and departure airports

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