$122 Find Cheap Flights from Islip to Missouri

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to Missouri departing on 1/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Missouri

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Missouri, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Missouri, as well as popular online travel agencies
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Cheap Flights from Islip to Missouri

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
St. Louis
St. Louis2 stops$185
Kansas City
Kansas City1 stop$230
St. Louis
St. Louis2 stops$185
Kansas City
Kansas City1 stop$230

Book Cheap Islip to Missouri Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip to Missouri that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to Missouri

Tue, Jan 20 - Thu, Jan 22
Frontier Logo
12:00 pm - 6:51 am
ISP
-
STL
19h 51m2 stops
Frontier Logo
5:42 pm - 8:47 pm
STL
-
ISP
26h 05m1 stop
$185Frontier
Tue, Jan 20 - Thu, Jan 22
Frontier Logo
12:00 pm - 11:33 pm
ISP
-
STL
12h 33m1 stop
Frontier Logo
5:42 pm - 8:47 pm
STL
-
ISP
26h 05m1 stop
$199Frontier
Tue, Jan 6 - Mon, Jan 12
Frontier Logo
12:55 pm - 10:33 pm
ISP
-
STL
10h 38m1 stop
Frontier Logo
8:50 am - 7:51 pm
STL
-
ISP
10h 01m1 stop
$207Frontier
Sat, Jan 17 - Sat, Jan 24
Multiple Airlines Logo
8:00 am - 4:09 pm
ISP
-
MCI
9h 09m1 stop
Multiple Airlines Logo
5:04 pm - 8:40 am
MCI
-
ISP
14h 36m1 stop
$230Multiple Airlines
Sat, Jan 17 - Sat, Jan 24
Multiple Airlines Logo
8:00 am - 10:31 am
ISP
-
MCI
27h 31m2 stops
Multiple Airlines Logo
5:04 pm - 8:40 am
MCI
-
ISP
14h 36m1 stop
$241Multiple Airlines
Tue, Jan 6 - Mon, Jan 12
Southwest Logo
3:45 pm - 9:55 pm
ISP
-
STL
7h 10m2 stops
Southwest Logo
2:35 pm - 9:55 pm
STL
-
ISP
6h 20m1 stop
$247Southwest
Tue, Jan 6 - Mon, Jan 12
Southwest Logo
3:45 pm - 9:55 pm
ISP
-
STL
7h 10m2 stops
Southwest Logo
2:15 pm - 9:55 pm
STL
-
ISP
6h 40m2 stops
$252Southwest
Tue, Jan 13 - Tue, Jan 20
Multiple Airlines Logo
8:00 am - 4:09 pm
ISP
-
MCI
9h 09m1 stop
Multiple Airlines Logo
5:04 pm - 6:46 pm
MCI
-
ISP
48h 42m2 stops
$264Multiple Airlines
Tue, Jan 13 - Tue, Jan 20
Southwest Logo
12:40 pm - 5:30 pm
ISP
-
MCI
5h 50m1 stop
Southwest Logo
6:15 am - 11:55 am
MCI
-
ISP
4h 40m1 stop
$333Southwest
Fri, Jan 30 - Sun, Feb 1
Southwest Logo
12:40 pm - 7:00 pm
ISP
-
STL
7h 20m1 stop
Southwest Logo
5:05 am - 11:55 am
STL
-
ISP
5h 50m1 stop
$340Southwest
Booking Insights

KAYAK's insights & trends for Islip to Missouri flights

Get data-powered insights and trends into flights from Islip to Missouri to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Islip to Missouri flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Missouri from Islip found in the last 72 hours was to St. Louis, at $404 round-trip. The most popular route is from Islip (ISP) to St. Louis (STL), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $404.

Good to know

Cheapest flight$122
Flight from Islip to St. Louis

FAQs - booking Missouri flights

  • How does KAYAK find such low prices on flights from Islip to Missouri?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Islip to Missouri.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Islip to Missouri?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Islip to Missouri is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Islip to Missouri?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Islip to Missouri with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Islip to Missouri?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Islip to Missouri up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Islip to Missouri

 
See real verified KAYAK customer reviews for airlines flying from Islip to Missouri. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Islip to Missouri? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
SouthwestOverall score based on 4250 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
Airline reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

2.0 MediocreRobert, Dec 2025
LAS - TPA
Read more Southwest reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

Airline travel is always too cramped to really be pleasant, but the cabin crew on this flight did a pretty good job of making up for it by putting on some music during boarding and sprinkling a few funny remarks into the safety briefing and announcements, and just generally being friendly and helpful. It definitely reminded me of why I prefer the in-flight experience on Southwest!

No delays and arrived to destination 30 min early. Staff was super friendly.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

It was rough. The staff was unprofessional, the choice of on board drinks terrible, it was cramped in space at every airport, they always ran out of overhead bin space so they pressured people to check bags for free or we couldn’t leave on the plane— so I did check my bag to help, and they nearly lost my bag. My bag did not arrive on the luggage belt, another man on my flight and I had to waste our time going to the baggage office to search for our bags. I would only fly southwest again if it was my last choice. Also, my flights were consistently delayed over and over again— at one point they straight up told us we were waiting for the pilot to arrive.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Had to get off plane from prior flight even though I had to reboard same plane to continue to my final destination.

Everything you need to know for your flight from Islip to Missouri

Information on your arrival and departure airports