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Islip

$80+ Cheap flights from Missouri to Islip (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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ISP
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$302
(Frontier)

One-way from

$80
(Frontier)

Popular in

December

Cheapest in

October

Average price

$298
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. 7% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This Frontier deal was found by Cheapflights users on 9/15. 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.
Thu 10/308:40 pmSTL - ISP
2 stops12h 57mFrontier
Sun 11/29:27 pmISP - STL
1 stop13h 13mFrontier
Deal found 9/15$202
This Southwest deal was found by Cheapflights users on 9/15. 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 12/49:45 amSTL - ISP
1 stop4h 35mSouthwest
Mon 12/83:55 pmISP - STL
1 stop7h 05mSouthwest
Deal found 9/15$239
This Frontier deal was found by Cheapflights users on 9/15. 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.
Thu 9/2510:49 amSTL - ISP
2 stops22h 51mFrontier
Mon 9/295:05 pmISP - STL
2 stops17h 01mFrontier
Deal found 9/15$272
This Southwest deal was found by Cheapflights users on 9/15. 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.
Fri 12/56:05 amSTL - ISP
1 stop5h 10mSouthwest
Sun 12/73:25 pmISP - STL
1 stop9h 25mSouthwest
Deal found 9/15$282
This Frontier deal was found by Cheapflights users on 9/15. 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 9/267:55 pmSTL - ISP
2 stops14h 00mFrontier
Mon 9/295:05 pmISP - STL
2 stops17h 01mFrontier
Deal found 9/15$291
This Frontier deal was found by Cheapflights users on 9/15. 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.
Thu 10/168:38 pmMCI - ISP
2 stops12h 59mFrontier
Sun 10/199:47 pmISP - MCI
2 stops13h 55mFrontier
Deal found 9/15$302
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Tue 9/305:15 amMCI - ISP
1 stop28h 25mMultiple Airlines
Sat 10/45:05 pmISP - MCI
2 stops41h 53mMultiple Airlines
Deal found 9/14$327
This Frontier deal was found by Cheapflights users on 9/16. 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 10/1011:37 amMCI - ISP
2 stops22h 00mFrontier
Sun 10/129:47 pmISP - MCI
2 stops13h 55mFrontier
Deal found 9/16$342
This Frontier deal was found by Cheapflights users on 9/14. 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 11/148:28 pmMCI - ISP
2 stops13h 09mFrontier
Sun 11/169:27 pmISP - MCI
2 stops13h 50mFrontier
Deal found 9/14$362
This Southwest deal was found by Cheapflights users on 9/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:05 pmMCI - ISP
1 stop4h 40mSouthwest
Sat 10/256:05 amISP - MCI
2 stops9h 15mSouthwest
Deal found 9/17$382
This Frontier deal was found by Cheapflights users on 9/16. 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.
Sat 9/207:55 pmSTL - ISP
2 stops12h 09mFrontier
Mon 9/225:05 pmISP - STL
2 stops17h 01mFrontier
Deal found 9/16$408
This Frontier deal was found by Cheapflights users on 9/17. 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.
Thu 10/308:28 pmMCI - ISP
2 stops13h 09mFrontier
Sun 11/29:27 pmISP - MCI
2 stops13h 50mFrontier
Deal found 9/17$415

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 September 17, 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

Thu 12/4

9:45 am-3:20 pm

1 stop4h 35m

Islip Long Island

Mon 12/8

3:55 pm-10:00 pm

1 stop7h 05m

$239

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Fri 12/5

6:05 am-12:15 pm

1 stop5h 10m

Islip Long Island

Sun 12/7

3:25 pm-11:50 pm

1 stop9h 25m

$282

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Thu 10/16

8:38 pm-10:37 am

2 stops12h 59m

Islip Long Island

Sun 10/19

9:47 pm-10:42 am

2 stops13h 55m

$302

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Tue 9/30

5:15 am-10:40 am

1 stop28h 25m

Islip Long Island

Sat 10/4

5:05 pm-9:58 am

2 stops41h 53m

$327

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Fri 10/10

11:37 am-10:37 am

2 stops22h 00m

Islip Long Island

Sun 10/12

9:47 pm-10:42 am

2 stops13h 55m

$342

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Thu 10/23

6:05 pm-11:45 pm

1 stop4h 40m

Islip Long Island

Sat 10/25

6:05 am-2:15 pm

1 stop9h 10m

$342

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Fri 11/14

8:28 pm-10:37 am

2 stops13h 09m

Islip Long Island

Sun 11/16

9:27 pm-10:17 am

2 stops13h 50m

$362

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Thu 10/30

8:28 pm-10:37 am

2 stops13h 09m

Islip Long Island

Sun 11/2

9:27 pm-10:17 am

2 stops13h 50m

$415

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Thu 10/9

11:37 am-9:04 am

2 stops20h 27m

Islip Long Island

Sun 10/12

9:47 pm-10:42 am

2 stops13h 55m

$433

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Sat 9/27

7:55 pm-9:04 am

2 stops12h 09m

Islip Long Island

Mon 9/29

5:05 pm-9:06 am

2 stops17h 01m

$481

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 24 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?

Currently, January is the cheapest month in which you can book a flight from Missouri to Islip (average of $108). Flying from Missouri to Islip in November is currently the most expensive (average of $213). 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 September 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Missouri to Islip as you normally would.

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?

    There are many flights that can get you from Missouri to Islip in 4h 35m. Fly via Southwest or Frontier to get the fastest option. There are 926 mi between Missouri and Islip. This flight may include one or multiple stops.

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

    The most popular route from Missouri to Islip 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?

    Currently, January is the cheapest month in which you can book a flight from Missouri to Islip (average of $108). Flying from Missouri to Islip in November is currently the most expensive (average of $213). 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$290Average$393FlexibilityNo cancel feeOn-time63%

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