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Islip

$343+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ISP
Mar 7 — Mar 141
Sat 3/7
Sat 3/14
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 5, 2026.

This Southwest deal was found by Cheapflights users on 2/5. 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.
Tue 6/23:55 pm
STL
-
ISP
1 stop5h 45m
Southwest
Thu 6/46:00 am
ISP
-
STL
1 stop5h 50m
Southwest
Deal found 2/5$343
This Southwest deal was found by Cheapflights users on 2/3. 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 8/66:05 am
STL
-
ISP
1 stop5h 30m
Southwest
Sun 8/96:20 am
ISP
-
STL
1 stop6h 30m
Southwest
Deal found 2/3$407
This Southwest deal was found by Cheapflights users on 2/5. 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.
Mon 2/235:05 am
STL
-
ISP
1 stop10h 20m
Southwest
Wed 2/2512:40 pm
ISP
-
STL
1 stop7h 20m
Southwest
Deal found 2/5$419
This Southwest deal was found by Cheapflights users on 2/5. 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.
Mon 2/236:20 am
MCI
-
ISP
1 stop9h 05m
Southwest
Wed 2/256:00 am
ISP
-
MCI
1 stop5h 35m
Southwest
Deal found 2/5$492
This Priceline deal was found by Cheapflights users on 2/5. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/611:18 am
STL
-
ISP
1 stop8h 29m
Frontier
Thu 2/123:34 pm
ISP
-
STL
1 stop9h 25m
Frontier
Deal found 2/5$500
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 2/611:18 am
STL
-
ISP
1 stop8h 29m
Multiple Airlines
Thu 2/127:26 pm
ISP
-
STL
2 stops36h 25m
Multiple Airlines
Deal found 2/5$628
This Southwest deal was found by Cheapflights users on 2/5. 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 2/612:05 pm
STL
-
ISP
2 stops9h 15m
Southwest
Thu 2/121:10 pm
ISP
-
STL
2 stops9h 15m
Southwest
Deal found 2/5$760

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 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$343
(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
Highest demand for flights based on searches. 11% potential increase in price ($38 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 5, 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

Tue 6/2

3:55 pm-10:40 pm

1 stop5h 45m

Islip Long Island

Thu 6/4

6:00 am-10:50 am

1 stop5h 50m

$343

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Mon 2/23

5:05 am-4:25 pm

1 stop10h 20m

Islip Long Island

Wed 2/25

12:40 pm-7:00 pm

1 stop7h 20m

$419

Kansas CityIslip

MCI - ISP

MCIISP

Kansas City

Mon 2/23

6:20 am-4:25 pm

1 stop9h 05m

Islip Long Island

Wed 2/25

6:00 am-10:35 am

1 stop5h 35m

$492

St. LouisIslip

STL - ISP

STLISP

Lambert-St Louis

Sat 2/21

9:41 am-7:28 pm

1 stop8h 47m

$519

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/5

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 June is currently the most expensive (average of $188). 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 5h 45m. Fly via Southwest 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 June is currently the most expensive (average of $188). 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

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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 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$259Average$401FlexibilityNo cancel feeOn-time63%

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