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Islip

$180+ Cheap flights from Missouri to Islip, NY (ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ISP
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This Frontier deal was found by Cheapflights users on 12/11. 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.
Sun 12/2110:02 amMCI - ISP
1 stop12h 57mFrontier
Thu 1/16:00 amISP - MCI
1 stop11h 26mFrontier
Deal found 12/11$338
This Expedia deal was found by Cheapflights users on 12/10. 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.
Thu 12/254:27 pmSTL - ISP
1 stop26h 13mFrontier
Mon 12/292:04 pmISP - STL
1 stop9h 29mFrontier
Deal found 12/10$472
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 12/1112:04 pmSTL - ISP
2 stops30h 30mFrontier
Sun 12/1411:15 amISP - STL
1 stop12h 18mFrontier
Deal found 12/10$621
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/264:27 pmSTL - ISP
1 stop24h 28mFrontier
Tue 12/3012:20 pmISP - STL
1 stop11h 13mFrontier
Deal found 12/11$729
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/264:27 pmSTL - ISP
1 stop24h 28mMultiple Airlines
Tue 12/304:40 pmISP - STL
2 stops42h 00mMultiple Airlines
Deal found 12/11$753
This Southwest deal was found by Cheapflights users on 12/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/117:00 amSTL - ISP
2 stops7h 20mSouthwest
Sun 12/1410:55 amISP - STL
2 stops9h 40mSouthwest
Deal found 12/10$855

Find flight deals from Missouri to Islip

Keep the following information in mind while searching for Missouri to Islip flight deals. Data was last updated December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$180
(Frontier)

Popular in

November

Cheapest in

April

Average price

$347
Provider with most accurate pricing for Lambert-St Louis-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-New York (NYC) flights.
Search Deals
From Missouri to Islip Long Island
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 12, 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 1/30

11:18 am-8:47 pm

1 stop8h 29m

Islip Long Island

Sun 3/1

1:10 pm-7:11 pm

1 stop7h 01m

$180

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Thu 12/25

4:27 pm-7:40 pm

1 stop26h 13m

Islip Long Island

Mon 12/29

2:04 pm-10:33 pm

1 stop9h 29m

$472

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Fri 12/26

4:27 pm-5:55 pm

1 stop24h 28m

Islip Long Island

Tue 12/30

12:20 pm-10:33 pm

1 stop11h 13m

$729

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Fri 12/26

4:27 pm-5:55 pm

1 stop24h 28m

Islip Long Island

Tue 12/30

4:40 pm-9:40 am

2 stops42h 00m

$753

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Tue 12/23

10:10 pm-11:25 am

2 stops36h 15m

$197

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Wed 12/24

5:19 pm-11:25 am

2 stops17h 06m

$223

SpringfieldIslip

SGF - ISP

SGFISP

Springfield-Branson

Thu 1/15

9:31 am-8:09 pm

3 stops33h 38m

$233

SpringfieldIslip

SGF - ISP

SGFISP

Springfield-Branson

Fri 1/16

10:42 am-10:46 pm

3 stops35h 04m

$240

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Tue 12/23

9:50 am-11:25 am

3 stops48h 35m

$243

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Wed 12/24

7:43 pm-7:40 pm

3 stops46h 57m

$286

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 11 results
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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, January is the cheapest month in which you can book a flight from Missouri to Islip, New York (average of $127). Flying from Missouri to Islip, New York in June is currently the most expensive (average of $184). 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 December 12, 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.

How much does it cost to fly round-trip from Missouri to Islip, New York?

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 8h 29m. 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 Kansas City - Islip Long Island. You may also consider Lambert-St Louis - 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, January is the cheapest month in which you can book a flight from Missouri to Islip, New York (average of $127). Flying from Missouri to Islip, New York in June is currently the most expensive (average of $184). 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?

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Alternative routes for Missouri to Islip

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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$259Average$386FlexibilityNo cancel feeOn-time63%

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