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Islip

$81+ Cheap flights from Missouri to Islip, NY (ISP)

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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ISP
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
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Cheap flight deals from Missouri to Islip

Keep the following information in mind while searching for Missouri to Islip flight deals. Data was last updated November 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$185
(Kiwi.com)

One-way from

$81
(Frontier)

Popular in

November

Cheapest in

April

Average price

$400
Provider with most accurate pricing for Lambert-St Louis-New York (NYC) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-New York (NYC) flights.
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From Missouri to Islip Long Island
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One-way flight from Missouri to Islip Long Island
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Highest demand for flights based on searches. 14% potential increase in price ($51 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Missouri to Islip

Cheapest flights from Missouri to Islip
Explore the most affordable flight options available from Missouri to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 26, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/25. 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.
Fri 12/129:54 amSTL - ISP
1 stop22h 19mFrontier
Tue 12/168:29 pmISP - STL
1 stop27h 04mFrontier
Deal found 11/25$185
This Frontier deal was found by Cheapflights users on 11/25. 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.
Wed 12/103:30 pmSTL - ISP
1 stop6h 14mFrontier
Sun 12/1411:15 amISP - STL
1 stop12h 18mFrontier
Deal found 11/25$187
This Kiwi.com deal was found by Cheapflights users on 11/25. 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.
Thu 12/113:30 pmSTL - ISP
1 stop27h 04mFrontier
Mon 12/1510:19 amISP - STL
1 stop13h 14mFrontier
Deal found 11/25$204
This Frontier deal was found by Cheapflights users on 11/25. 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.
Fri 12/59:54 amSTL - ISP
1 stop8h 40mFrontier
Sun 12/711:15 amISP - STL
1 stop12h 18mFrontier
Deal found 11/25$212
This Expedia deal was found by Cheapflights users on 11/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:27 pmSTL - ISP
1 stop23h 10mFrontier
Mon 1/58:24 pmISP - STL
1 stop27h 09mFrontier
Deal found 11/25$213
This Kiwi.com deal was found by Cheapflights users on 11/25. 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.
Fri 12/1210:42 amSTL - ISP
2 stops21h 31mMultiple Airlines
Tue 12/168:29 pmISP - STL
1 stop27h 04mMultiple Airlines
Deal found 11/25$222
This Kiwi.com deal was found by Cheapflights users on 11/25. 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.
Mon 12/153:30 pmSTL - ISP
1 stop27h 04mFrontier
Wed 12/176:00 amISP - STL
1 stop17h 33mFrontier
Deal found 11/25$293

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri to Islip 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 November 26, 2025.
Use the filters below to find and compare flights from Missouri to Islip that are best for you.

Fly from

Missouri

Fly to

Islip

Route

Depart

Return

Price

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Fri 12/12

9:54 am-9:13 am

1 stop22h 19m

Islip Long Island

Tue 12/16

8:29 pm-10:33 pm

1 stop27h 04m

$185

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Thu 12/11

3:30 pm-7:34 pm

1 stop27h 04m

Islip Long Island

Mon 12/15

10:19 am-10:33 pm

1 stop13h 14m

$204

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Fri 12/12

9:54 am-7:34 pm

1 stop8h 40m

Islip Long Island

Sun 12/14

11:15 am-8:59 am

1 stop22h 44m

$212

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Tue 12/30

4:27 pm-4:37 pm

1 stop23h 10m

Islip Long Island

Mon 1/5

8:24 pm-10:33 pm

1 stop27h 09m

$213

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Mon 12/22

10:40 am-7:40 pm

1 stop8h 00m

Islip Long Island

Mon 12/29

2:04 pm-10:33 pm

1 stop9h 29m

$264

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Mon 12/15

3:30 pm-7:34 pm

1 stop27h 04m

Islip Long Island

Wed 12/17

6:00 am-10:33 pm

1 stop17h 33m

$293

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Mon 12/15

12:05 pm-9:40 pm

1 stop8h 35m

Islip Long Island

Wed 12/17

5:40 am-12:35 pm

2 stops7h 55m

$322

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Wed 12/3

3:30 pm-10:44 pm

1 stop6h 14m

$81

SpringfieldIslip

SGF - ISP

SGFISP

Springfield-Branson

Thu 12/18

8:25 pm-1:39 pm

2 stops40h 14m

$240

SpringfieldIslip

SGF - ISP

SGFISP

Springfield-Branson

Mon 3/9

12:19 pm-11:17 am

3 stops45h 58m

$268

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/23

Showing 1-10 of 12 results
1
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Best time to book a flight from Missouri to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Missouri 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 Missouri to Islip

What is the cheapest month to book a flight from Missouri to Islip, New York?

Currently, August is the cheapest month in which you can book a flight from Missouri to Islip, New York (average of $129). Flying from Missouri to Islip, New York in November is currently the most expensive (average of $192). 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.

What is the cheapest time of day to fly from MO to ISP?

Find hourly flight availability from Missouri to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 26, 2025.

When flying from Missouri to Islip, New York, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 64% versus a flight in the morning.

Related info for your journey

Find useful and relevant information for your journey from Missouri to Islip. 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 into for flights to Islip from Missouri?

    If you book a flight to Islip from Missouri, you will be flying to Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • How long is the flight from Missouri to Islip, New York?

    There are many flights that can get you from Missouri to Islip, New York in 22h 19m. Fly via Frontier to get the fastest option. There are 926 mi between Missouri and Islip, New York.

  • What are the most popular routes from Missouri to Islip, New York?

    The most popular route from Missouri to Islip, New York is Lambert-St Louis - Islip Long Island. You may also consider Kansas City - Islip Long Island or Springfield-Branson - Islip Long Island.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Missouri to Islip 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 Missouri to Islip, New York?

    Currently, August is the cheapest month in which you can book a flight from Missouri to Islip, New York (average of $129). Flying from Missouri to Islip, New York in November is currently the most expensive (average of $192). 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

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

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Alternative routes for Missouri to Islip

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

Discover the top airline that operate flights from Missouri to Islip. 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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$259Average$386FlexibilityNo cancel feeOn-time63%

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