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Missouri

$80+ Cheap flights from Islip (ISP) to Missouri

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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — STL
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Islip to Missouri

Keep the following information in mind while searching for Islip to Missouri flight deals. Data was last updated September 15, 2025.

Round-trip from

$202
(Frontier)

One-way from

$80
(Cheapflightsfares)

Popular in

January

Cheapest in

October

Average price

$348
From Islip Long Island to Missouri
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One-way flight from Islip Long Island to Missouri
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Highest demand for flights based on searches. 11% potential increase in price ($48 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 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 Islip to Missouri

Cheapest flights from Islip to Missouri
Explore the most affordable flight options available from Islip to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/295:05 pmISP - STL
2 stops17h 01mFrontier
Fri 10/39:32 pmSTL - ISP
1 stop12h 23mFrontier
Deal found 9/13$202
This Southwest deal was found by Cheapflights users on 9/13. 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.
Wed 12/312:55 pmISP - STL
1 stop10h 05mSouthwest
Tue 12/1612:05 pmSTL - ISP
1 stop8h 30mSouthwest
Deal found 9/13$222
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/211:40 amISP - STL
2 stops22h 26mFrontier
Sun 10/510:39 amSTL - ISP
2 stops23h 01mFrontier
Deal found 9/13$237
This Frontier deal was found by Cheapflights users on 9/12. 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.
Mon 10/274:58 pmISP - STL
2 stops17h 09mFrontier
Sat 11/18:40 pmSTL - ISP
2 stops11h 22mFrontier
Deal found 9/12$245
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/211:40 amISP - STL
2 stops22h 26mFrontier
Mon 10/67:55 pmSTL - ISP
2 stops17h 18mFrontier
Deal found 9/13$246
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/211:40 amISP - STL
2 stops22h 26mFrontier
Wed 10/87:52 pmSTL - ISP
2 stops12h 12mFrontier
Deal found 9/13$275
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 12/49:09 pmISP - STL
1 stop12h 36mFrontier
Tue 12/165:11 pmSTL - ISP
1 stop25h 03mFrontier
Deal found 9/13$279
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 12/42:19 pmISP - STL
2 stops33h 27mMultiple Airlines
Mon 12/155:11 pmSTL - ISP
1 stop25h 03mMultiple Airlines
Deal found 9/13$281
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Wed 10/111:35 amISP - STL
2 stops28h 29mFrontier
Sun 10/51:57 pmSTL - ISP
1 stop19h 43mFrontier
Deal found 9/13$283
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 12/49:09 pmISP - STL
1 stop12h 36mFrontier
Mon 12/155:11 pmSTL - ISP
1 stop25h 03mFrontier
Deal found 9/13$284
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Sat 12/69:09 pmISP - STL
1 stop12h 36mFrontier
Tue 12/165:11 pmSTL - ISP
1 stop25h 03mFrontier
Deal found 9/13$286
This Southwest deal was found by Cheapflights users on 9/13. 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.
Wed 11/55:40 amISP - MCI
1 stop6h 55mSouthwest
Sun 11/95:25 amMCI - ISP
1 stop6h 25mSouthwest
Deal found 9/13$352

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Missouri 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 15, 2025.
Use the filters below to find and compare flights from Islip to Missouri that are best for you.

Fly from

Islip

Fly to

Missouri

Route

Depart

Return

Price

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Mon 9/29

5:05 pm-9:06 am

2 stops17h 01m

Lambert-St Louis

Fri 10/3

9:32 pm-10:55 am

1 stop12h 23m

$202

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Wed 12/3

12:55 pm-10:00 pm

1 stop10h 05m

Lambert-St Louis

Tue 12/16

12:05 pm-9:35 pm

1 stop8h 30m

$222

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Fri 10/3

5:05 pm-9:06 am

2 stops17h 01m

Lambert-St Louis

Sun 10/5

10:39 am-10:40 am

2 stops23h 01m

$237

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 10/2

11:40 am-9:06 am

2 stops22h 26m

Lambert-St Louis

Sun 10/5

10:39 am-10:40 am

2 stops23h 01m

$237

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Mon 10/27

4:58 pm-9:07 am

2 stops17h 09m

Lambert-St Louis

Sat 11/1

8:40 pm-9:02 am

2 stops11h 22m

$245

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Thu 10/2

11:40 am-9:06 am

2 stops22h 26m

Lambert-St Louis

Sat 10/4

7:55 pm-9:04 am

2 stops12h 09m

$246

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Sat 10/4

5:05 pm-9:06 am

2 stops17h 01m

Lambert-St Louis

Tue 10/7

7:52 pm-2:13 pm

2 stops17h 21m

$246

IslipSt. Louis

ISP - STL

ISPSTL

Islip Long Island

Fri 10/3

5:05 pm-9:06 am

2 stops17h 01m

Lambert-St Louis

Tue 10/7

7:52 pm-2:13 pm

2 stops17h 21m

$246

IslipKansas City

ISP - MCI

ISPMCI

Islip Long Island

Wed 11/5

5:40 am-11:35 am

1 stop6h 55m

Kansas City

Sun 11/9

5:25 am-12:50 pm

1 stop6h 25m

$352

IslipKansas City

ISP - MCI

ISPMCI

Islip Long Island

Sat 2/21

1:10 pm-10:05 pm

2 stops9h 55m

Kansas City

Sun 2/22

5:55 am-12:15 pm

1 stop5h 20m

$372

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 17 results
1
2

Best time to book a flight from Islip to Missouri

Have a flexible travel schedule? Discover the best time to fly to Missouri from Islip 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 Islip to Missouri

What is the cheapest month to book a flight from Islip to Missouri?

Currently, August is the cheapest month in which you can book a flight from Islip to Missouri (average of $311). Flying from Islip to Missouri in March is currently the most expensive (average of $356). 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 ISP to MO?

Find hourly flight availability from Islip to Missouri. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

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

Reviews of airlines servicing Missouri

Get insights into the airlines that provide service to Missouri. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Missouri. Reviews last updated September 15, 2025.
Peruse reviews from past customers who have flown with Southwest from Islip to Missouri to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Islip to Missouri. 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 from for flights from Islip to Missouri?

    If you book a flight to Missouri from Islip, you will be flying from 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 Islip to Missouri?

    Airlines like Frontier and Southwest fly from Islip to Missouri in about 10h 05m. The time it takes to get you to your destination can typically vary by up to 6h 56m. There are 926 mi between Islip and Missouri. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    While some choose either Islip Long Island - Lambert-St Louis or Islip Long Island - Columbia Regional, Islip Long Island - Kansas City is the most popular route from Islip to Missouri.

  • Can I find deals for flights from Islip to Missouri that include hotel bookings?

    Yes. In addition to deals on Islip to Missouri flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Missouri?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Missouri.

  • Can I find deals for business class flights from Islip to Missouri?

    Yes. Cheapflights offers flight deals from Islip to Missouri 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 Islip to Missouri?

    Currently, August is the cheapest month in which you can book a flight from Islip to Missouri (average of $311). Flying from Islip to Missouri in March is currently the most expensive (average of $356). 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

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Alternative routes for Islip to Missouri

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Islip to Missouri

Discover the top airline that operate flights from Islip to Missouri. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$304Average$391FlexibilityNo cancel feeOn-time63%

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