Cheap flight deals from St. Louis to Islip

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

Round-trip
One way

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to fly from St. Louis to Islip?

We monitor flight fares to help you find the best deals effortlessly

Cheapest flights

From price

Apr

30 6
6 13
13 20
20 27
May

27 4
4 11
11 18
18 25
Jun

25 1
1 8
8 15
15 22

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

When are flight tickets from St. Louis (STL) to Islip (ISP) the cheapest?

Airlines adjust prices for flights from St. Louis to Islip based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much do flights from St. Louis (STL) to Islip (ISP) cost?

According to Trip.com's data, the lowest price is around Rp 5,611,741.
What is the transportation method from the main airport to downtown in Islip?
- The distance from Long Island Macarthur Airport to downtown is about 11 km. It takes about 30 minutes by taxi.

How to find a cheap flight from St. Louis to Islip

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Islip. Book your flights at the right time and save more.

Be flexible with your travel dates to get the cheapest St. Louis to Islip ticket.

Tap "Date" in the flight search bar to browse the calendar and find airfare from St. Louis to Islip for the next six months in 2025. If you're looking to fly within the next three months, the lowest fare is Rp 1586974 for a one-way ticket on Tue, Apr 29.

Compare cheap St. Louis to Islip flight deals from hundreds of airlines.

Our powerful search system compares prices from over 500 airlines. So you can find the cheapest flights from St. Louis to Islip. The most affordable airline currently operating on this route is Spirit Airlines.

Set up a Price Alert to track fare drops.

Set up a Price Alert for your St. Louis to Islip route to track ticket prices effortlessly—no need to check manually every day.

Don't miss out on cheap St. Louis to Islip flight deals and promo codes.

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Book early or wait unitl the last minute to fine the best fares.

It's always better to book early! Airlines typically release their lowest fares about a year before departure, so check as soon as flights become available. If you miss that window, you may still find great deals closer to your travel date.

Search for flights on the go.

For the best booking experience on the go, download Trip.com and search for cheap flights from St. Louis to Islip to access exclusive deals just for you.

Flight Info | St. Louis to Islip

Cheapest one-way flight price	Rp 1,586,973
Off-season for travel	March
Peak season for travel	January
Flight distance	1,478.87 km
Popular airline	Frontier Airlines