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$81+ Cheap flights from Islip (ISP) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — ORD
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
1 adult, Economy
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Cheap flight deals from Islip to Illinois

Keep the following information in mind while searching for Islip to Illinois flight deals. Data was last updated agosto 20, 2025.

Round-trip from

$164
(Priceline)

One-way from

$81
(Priceline)

Popular in

June

Cheapest in

September

Average price

$269
From Islip Long Island to Illinois
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One-way flight from Islip Long Island to Illinois
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Highest demand for flights based on searches. 11% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Islip to Illinois

Cheapest flights from Islip to Illinois
Explore the most affordable flight options available from Islip to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 20, 2025.

This Priceline deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/2511:40 amISP - ORD
1 stop9h 04mFrontier
dom. 9/288:05 amORD - ISP
1 stop7h 22mFrontier
Deal found 8/18$164
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/125:05 pmISP - ORD
2 stops18h 47mMultiple Airlines
lun. 9/158:49 pmORD - ISP
1 stop12h 51mMultiple Airlines
Deal found 8/18$186
This Frontier deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/2511:40 amISP - ORD
2 stops12h 40mFrontier
lun. 9/298:49 pmORD - ISP
1 stop12h 51mFrontier
Deal found 8/19$197
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/59:49 amISP - ORD
2 stops15h 21mFrontier
jue. 9/258:49 pmORD - ISP
1 stop12h 51mFrontier
Deal found 8/17$199
This Frontier deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/79:49 amISP - ORD
2 stops13h 56mFrontier
lun. 9/88:49 pmORD - ISP
1 stop12h 51mFrontier
Deal found 8/19$204
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/2511:40 amISP - ORD
1 stop9h 04mFrontier
vie. 9/268:49 pmORD - ISP
1 stop13h 06mFrontier
Deal found 8/19$218
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/155:05 pmISP - ORD
2 stops18h 47mMultiple Airlines
lun. 9/228:49 pmORD - ISP
1 stop12h 51mMultiple Airlines
Deal found 8/18$225
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/26:05 amISP - ORD
1 stop17h 17mMultiple Airlines
sáb. 9/65:17 pmORD - ISP
1 stop16h 33mMultiple Airlines
Deal found 8/18$232
This Frontier deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/711:35 amISP - STL
1 stop26h 27mFrontier
lun. 9/151:57 pmSTL - ISP
1 stop19h 43mFrontier
Deal found 8/20$239
This FlightHub deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/2511:40 amISP - STL
1 stop26h 22mFrontier
dom. 9/281:52 pmSTL - ISP
1 stop19h 48mFrontier
Deal found 8/19$245
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/411:45 amISP - STL
1 stop26h 17mFrontier
dom. 9/71:52 pmSTL - ISP
1 stop19h 48mFrontier
Deal found 8/20$275
This Frontier deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/265:05 pmISP - STL
2 stops17h 01mFrontier
dom. 9/2810:39 amSTL - ISP
2 stops23h 01mFrontier
Deal found 8/18$279

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 20, 2025.
Use the filters below to find and compare flights from Islip to Illinois that are best for you.

Fly from

Islip

Fly to

Illinois

Route

Depart

Return

Price

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

jue. 9/25

11:40 am-7:44 pm

1 stop9h 04m

Chicago O'Hare Intl

dom. 9/28

8:05 am-4:27 pm

1 stop7h 22m

$164

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

jue. 9/11

11:25 am-7:44 pm

1 stop9h 19m

Chicago O'Hare Intl

dom. 9/14

8:05 am-4:27 pm

1 stop7h 22m

$173

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

vie. 9/12

5:05 pm-10:52 am

2 stops18h 47m

Chicago O'Hare Intl

lun. 9/15

8:49 pm-10:40 am

1 stop12h 51m

$186

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

jue. 9/25

11:40 am-11:20 pm

2 stops12h 40m

Chicago O'Hare Intl

lun. 9/29

8:49 pm-10:40 am

1 stop12h 51m

$197

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

vie. 9/5

9:49 am-12:10 am

2 stops15h 21m

Chicago O'Hare Intl

jue. 9/25

8:49 pm-10:40 am

1 stop12h 51m

$199

IslipChicago

ISP - ORD

ISPORD

Islip Long Island

dom. 9/7

9:49 am-10:45 pm

2 stops13h 56m

Chicago O'Hare Intl

lun. 9/8

8:49 pm-10:40 am

1 stop12h 51m

$204

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

dom. 9/7

11:35 am-1:02 pm

1 stop26h 27m

Lambert-St Louis

lun. 9/15

1:57 pm-10:40 am

1 stop19h 43m

$239

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

jue. 9/25

11:40 am-1:02 pm

1 stop26h 22m

Lambert-St Louis

dom. 9/28

1:52 pm-10:40 am

1 stop19h 48m

$245

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

jue. 9/4

11:45 am-1:02 pm

1 stop26h 17m

Lambert-St Louis

dom. 9/7

1:52 pm-10:40 am

1 stop19h 48m

$275

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

vie. 9/26

5:05 pm-9:06 am

2 stops17h 01m

Lambert-St Louis

dom. 9/28

10:39 am-10:40 am

2 stops23h 01m

$279

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 30 results
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Best time to book a flight from Islip to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Islip to Illinois?

Currently, August is the cheapest month in which you can book a flight from Islip to Illinois (average of $245). Flying from Islip to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated agosto 20, 2025.
See what other customers who have flown with Southwest from Islip to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Islip to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Illinois?

    Islip Long Island (ISP), located 7.2 mi from the city center, is the airport you fly out of when you book flights from Islip to Illinois.

  • How long is the flight from Islip to Illinois?

    Frontier can get you from Islip to Illinois in just under 9h 04m. Your travel time can differ by up to . Islip and Illinois are separated by a distance of 770 mi.

  • What are the most popular routes from Islip to Illinois?

    Most travelers choose Islip Long Island - Chicago O'Hare Intl, Islip Long Island - Lambert-St Louis or Islip Long Island - Decatur Arpt when deciding on the best route from Islip to Illinois.

  • Can I find deals for flights from Islip to Illinois that include hotel bookings?

    Yes. In addition to deals on Islip to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Illinois.

  • Can I find deals for business class flights from Islip to Illinois?

    Yes. Cheapflights offers flight deals from Islip to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Islip to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Islip to Illinois (average of $245). Flying from Islip to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Islip to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Islip to Illinois

Discover the top airline that operate flights from Islip to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$336Average$772FlexibilityNo cancel feeOn-time63%

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