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Find cheap flights from Islip to Missouri from $228

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to Missouri departing on 6/19. 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
0 bags
Sat 6/29
Sat 7/6

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Best Missouri Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

St. Louis
St. Louis1 stop$228

Good to know

Cheapest flight

$228
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 to Missouri from Islip 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 to Missouri with an airline and back to Islip 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 to Missouri from Islip up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Missouri

  • On average*, there is no price difference when choosing to fly in the morning or the evening on this flight route.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top airline flying from Islip to Missouri

 
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.
6.2
FrontierOverall score based on 4016 reviews
5.8Comfort
7.1Crew
5.1Food
4.9Entertainment
6.6Boarding
Airline reviews

9hrs delay and didn’t provided anything until after flight landed $75 voucher for fiuture travel no meals or anything.

2.0 MediocreTeddy, May 2024LAS - SAN
Read more about Frontier reviews

9hrs delay and didn’t provided anything until after flight landed $75 voucher for fiuture travel no meals or anything.

It was ridiculously hard to check in for the flight, and Frontier charged us a LOT of money to have a carry on suitcase, and then told everyone we could not carry on bags and had to check them through at the gate, and didn't refund the extra money we paid to have the suitcase as carry on.

I had a terrible experience with Frontier. I arrived before the 60 minute cut off and was told that Frontier has a two hour window for bags. I was then told the next available flight wasn’t until the end of the day (I had booked a 6am flight). I took a look around and saw other people being told that they could not board their flights or that they had to pay additional fees. I opted to rebook on American Airlines. There’s absolutely no straightforward way to contact Frontier, so this ticket was a complete waste of money. Oh - and the kicker is that the lady lied about the two hour cut off.

Frontier won’t help you at the airport without paying $25. Carry on was $75. Then you get on the plain and every beverage or snack is also a charge. Seats are hard and real packed in. I would never fly them again.

Worst experience I have seen. The flight was cancelled without any reason.

My experience with frontier staff at the Denver airport was absolutely horrible. The manager on duty was even worst if was the worst experience I have ever had, I have never been treated so poorly as a customer in my life! The staff was extremely rude, eye rolls and attitude and then refusal to help me at all. I wish I could never fly frontier again that’s how horrible it was!

The Frontier app wasn’t working. So I could not pay for a carry on the week prior to flying. They charged me 99$ at the gate to carry on a duffle bag.

Good for the price. My only complaint is that the pilot should keep the air flowing while passengers are waiting to getting out of airplane.

Plane could have been more on time. More leg room .

I arrived 1 hour prior to boarding, and they said I was too late for a domestic flight. First time I heard that :-(

Book cheap flights from Islip to Missouri

Recent round-trip flight deals

6/19Wed
1 stopFrontier
15h 21mISP-STL
6/22Sat
1 stopFrontier
24h 45mSTL-ISP
$228
7/5Fri
1 stopFrontier
16h 44mISP-STL
7/10Wed
1 stopFrontier
12h 06mSTL-ISP
$312
7/2Tue
1 stopFrontier
11h 42mISP-STL
7/7Sun
1 stopFrontier
11h 27mSTL-ISP
$327
6/27Thu
3 stops
17h 04mISP-MCI
7/4Thu
3 stops
33h 08mMCI-ISP
$470
6/26Wed
1 stopFrontier
15h 21mISP-STL
7/3Wed
1 stopFrontier
17h 35mSTL-ISP
$495
6/27Thu
2 stops
20h 50mISP-MCI
7/4Thu
3 stops
33h 08mMCI-ISP
$509

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Recent one-way flight deals

7/7Sun
1 stopFrontier
11h 21mISP-STL
$245

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Islip - Missouri Flights

Departure:

Islip (ISP)United States

Return flight deals:

Missouri - Islip

Cabin classes: