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Islip

$122+ 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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ISP
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
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 February 13, 2026.

This Frontier deal was found by Cheapflights users on 2/12. 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 3/129:05 pm
STL
-
ISP
1 stop11h 43m
Frontier
Mon 3/1610:58 am
ISP
-
STL
1 stop7h 42m
Frontier
Deal found 2/12$270
This Southwest deal was found by Cheapflights users on 2/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/232:05 pm
STL
-
ISP
2 stops8h 15m
Southwest
Wed 5/274:10 pm
ISP
-
STL
1 stop6h 00m
Southwest
Deal found 2/11$355
This Southwest deal was found by Cheapflights users on 2/12. 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 5/225:00 am
STL
-
ISP
1 stop5h 50m
Southwest
Sun 5/246:05 am
ISP
-
STL
1 stop5h 45m
Southwest
Deal found 2/12$391
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Wed 2/254:24 pm
MCI
-
ISP
1 stop21h 15m
Multiple Airlines
Sun 3/15:07 pm
ISP
-
MCI
2 stops17h 46m
Multiple Airlines
Deal found 2/10$399
This Kiwi.com deal was found by Cheapflights users on 2/13. 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 2/264:24 pm
MCI
-
ISP
1 stop14h 14m
Multiple Airlines
Fri 2/273:34 pm
ISP
-
MCI
2 stops43h 56m
Multiple Airlines
Deal found 2/13$440
This Southwest deal was found by Cheapflights users on 2/10. 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 6/410:00 am
MCI
-
ISP
1 stop6h 15m
Southwest
Mon 6/86:00 am
ISP
-
MCI
1 stop5h 05m
Southwest
Deal found 2/10$447
This Southwest deal was found by Cheapflights users on 2/10. 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.
Wed 2/252:00 pm
MCI
-
ISP
1 stop6h 55m
Southwest
Sun 3/15:35 am
ISP
-
MCI
1 stop8h 10m
Southwest
Deal found 2/10$487
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Tue 2/173:49 pm
STL
-
ISP
1 stop20h 24m
Multiple Airlines
Sat 2/2111:50 am
ISP
-
STL
2 stops44h 01m
Multiple Airlines
Deal found 2/11$545
This Frontier deal was found by Cheapflights users on 2/12. 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 3/129:05 pm
STL
-
ISP
1 stop11h 43m
Frontier
Thu 3/194:34 pm
ISP
-
STL
1 stop7h 45m
Frontier
Deal found 2/12$563
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Tue 2/173:49 pm
STL
-
ISP
1 stop20h 24m
Frontier
Sat 2/2111:41 am
ISP
-
STL
1 stop13h 18m
Frontier
Deal found 2/11$664
This Southwest deal was found by Cheapflights users on 2/13. 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 2/266:05 pm
MCI
-
ISP
1 stop4h 25m
Southwest
Fri 2/276:35 am
ISP
-
MCI
1 stop8h 00m
Southwest
Deal found 2/13$682
This Frontier deal was found by Cheapflights users on 2/9. 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 4/24:54 pm
STL
-
ISP
1 stop6h 01m
Frontier
Sun 4/58:36 pm
ISP
-
STL
1 stop12h 15m
Frontier
Deal found 2/9$698

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 February 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$270
(Frontier)

One-way from

$122
(Southwest)

Popular in

November

Cheapest in

April

Average price

$325
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
One-way flight from Missouri to Islip Long Island
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 13, 2026.
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 3/12

9:05 pm-9:48 am

1 stop11h 43m

Islip Long Island

Mon 3/16

10:58 am-5:40 pm

1 stop7h 42m

$270

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Sat 5/23

6:20 am-4:00 pm

1 stop8h 40m

Islip Long Island

Wed 5/27

4:10 pm-9:10 pm

1 stop6h 00m

$355

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Fri 5/22

5:00 am-11:50 am

1 stop5h 50m

Islip Long Island

Sun 5/24

6:05 am-10:50 am

1 stop5h 45m

$391

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Wed 2/25

4:24 pm-2:39 pm

1 stop21h 15m

Islip Long Island

Sun 3/1

5:07 pm-9:53 am

2 stops17h 46m

$399

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Thu 2/26

4:24 pm-7:38 am

1 stop14h 14m

Islip Long Island

Fri 2/27

3:34 pm-10:30 am

2 stops43h 56m

$440

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Thu 6/4

10:00 am-5:15 pm

1 stop6h 15m

Islip Long Island

Mon 6/8

6:00 am-10:05 am

1 stop5h 05m

$447

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Wed 2/25

2:00 pm-9:55 pm

1 stop6h 55m

Islip Long Island

Sun 3/1

5:35 am-12:45 pm

1 stop8h 10m

$487

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Thu 3/12

9:05 pm-9:48 am

1 stop11h 43m

Islip Long Island

Thu 3/19

4:34 pm-11:19 pm

1 stop7h 45m

$563

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Thu 2/26

6:05 pm-11:30 pm

1 stop4h 25m

Islip Long Island

Fri 2/27

6:35 am-1:35 pm

1 stop8h 00m

$682

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Thu 4/2

4:54 pm-11:55 pm

1 stop6h 01m

Islip Long Island

Sun 4/5

8:36 pm-7:51 am

1 stop12h 15m

$698

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Showing 1-10 of 21 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 $121). Flying from Missouri to Islip, New York in June is currently the most expensive (average of $204). 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.

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 40m. Fly via Frontier or Southwest 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, January is the cheapest month in which you can book a flight from Missouri to Islip, New York (average of $121). Flying from Missouri to Islip, New York in June is currently the most expensive (average of $204). 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

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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 February 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$259Average$401FlexibilityNo cancel feeOn-time63%

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