Cheap Flights from STL to ISP: When to Fly from St. Louis to Islip

 

The cheapest times to fly from STL to ISP are

• January 1st to March 4th (except the week of February 19th)
• March 26th to May 13th (except the week of April 30th)
• early to mid July
• September 3rd to November 18th (except the week of October 1st)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from STL to ISP is late January. Prices can be as high as $940 for Sunday flights during mid May, or as low as $244 for Tuesday flights around late January.

 

When to Fly to Islip

Flying from St. Louis, MO (STL) to Islip, NY (ISP) will usually cost between $244 to $538 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $245. Due to high demand the most expensive time to fly is mid May, with an average price of $504. Planning your trip to low-cost times can easily save you $259 on economy flights and even more on first-class flights. Generally, any price below $300 can be considered a good price for a round-trip STL to ISP flight.

See below for a graph of average weekly prices for the STL to ISP route. All prices are for round-trip tickets in USD.

Compared to other flights, the STL to ISP flight is much cheaper than the average and costs much less than the average flight leaving from St. Louis. The average price per mile (for a direct flight) is $0.2, which is below average.

 

Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $92 (24%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $287. Return trip prices are from the ISP to STL flight, and often highlight the quality of our data in showing the same trend.

 

Nonstop Flights and Layovers

Travelers looking to fly from STL to ISP can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 2 hour 39 minutes may not be realistic.

 

Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from STL to ISP while comparing.

 

Flight Questions Answered

Still have questions about flying from STL to ISP? We’ve got answers.

Which airlines fly this route?

You can find 4 major airlines flying this route most often: American, Cape Air, Frontier, Southwest, and potentially more during busy seasons.

How far away is it from Long Island MacArthur Airport to St Louis Lambert International Airport?

The distance between the two airports is roughly 926 miles or 1490 kilometers.

How long does it take to fly from STL to ISP?

The real-world flight time for a nonstop STL to ISP flight is about 2 hour 39 minutes.

How many flights go between St. Louis, MO and Islip, NY?

It depends on the day of the week and the date, but a typical day might have around 54 available flights from STL to ISP.

 

Airport Location Info

 

 

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.