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Islip

$116+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ISP
dec. 21 — dec. 281
søn. 12/21
søn. 12/28
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 21, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$366
(Southwest)

One-way from

$116
(Mytrip)

Popular in

November

Cheapest in

April

Average price

$385
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. 13% potential increase in price ($48 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 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 21, 2025.

This Southwest deal was found by Cheapflights users on 11/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 12/225:00 amSTL - ISP
1 stop8h 00mSouthwest
ons. 12/243:40 pmISP - STL
1 stop7h 05mSouthwest
Deal found 11/20$366
This Southwest deal was found by Cheapflights users on 11/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 12/112:40 pmMCI - ISP
1 stop6h 25mSouthwest
søn. 12/145:50 amISP - MCI
1 stop6h 30mSouthwest
Deal found 11/20$393
This Frontier deal was found by Cheapflights users on 11/20. 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.
fre. 11/219:55 amMCI - ISP
1 stop13h 04mFrontier
lør. 11/296:00 amISP - MCI
1 stop11h 52mFrontier
Deal found 11/20$447
This Kiwi.com deal was found by Cheapflights users on 11/20. 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.
søn. 11/234:13 pmSTL - ISP
1 stop14h 49mMultiple Airlines
tir. 11/259:09 pmISP - STL
2 stops42h 20mMultiple Airlines
Deal found 11/20$659
This Kiwi.com deal was found by Cheapflights users on 11/20. 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.
søn. 11/234:13 pmSTL - ISP
1 stop14h 49mFrontier
tir. 11/259:09 pmISP - STL
1 stop27h 48mFrontier
Deal found 11/20$667
This Frontier deal was found by Cheapflights users on 11/19. 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.
søn. 12/2110:02 amMCI - ISP
1 stop12h 57mFrontier
tor. 12/256:00 amISP - MCI
1 stop11h 26mFrontier
Deal found 11/19$716
This Southwest deal was found by Cheapflights users on 11/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
søn. 11/237:50 amSTL - ISP
2 stops8h 05mSouthwest
tir. 11/252:40 pmISP - STL
2 stops9h 50mSouthwest
Deal found 11/20$855

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 21, 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

man. 12/22

5:00 am-2:00 pm

1 stop8h 00m

Islip Long Island

ons. 12/24

3:40 pm-9:45 pm

1 stop7h 05m

$366

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

tor. 12/11

2:40 pm-10:05 pm

1 stop6h 25m

Islip Long Island

søn. 12/14

5:50 am-11:20 am

1 stop6h 30m

$393

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

søn. 12/21

10:02 am-11:59 pm

1 stop12h 57m

Islip Long Island

tor. 12/25

6:00 am-4:26 pm

1 stop11h 26m

$716

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

tor. 1/8

4:28 pm-7:54 pm

3 stops26h 26m

$116

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

fre. 11/28

9:55 am-11:59 pm

1 stop13h 04m

$157

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

søn. 1/11

4:28 pm-7:54 pm

3 stops26h 26m

$159

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

tor. 1/8

6:15 am-11:55 am

1 stop4h 40m

$180

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

tir. 12/9

2:00 pm-9:40 pm

1 stop6h 40m

$196

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

søn. 1/11

6:10 am-1:30 pm

1 stop6h 20m

$204

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

tir. 12/9

3:30 pm-12:20 pm

3 stops43h 50m

$212

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 13 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, 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 21, 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 8h. Fly via Southwest or Frontier to get the fastest option. There are 926 mi between Missouri and Islip, New York. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$259Average$379FlexibilityNo cancel feeOn-time63%

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