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ISP (Islip) to STL (St. Louis) Flights $391.6

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Cheap ISP to STL Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Interesting Facts About Flights from Islip to St. Louis (ISP to STL)

Question : Would you be willing to change your travel days if it saved you money?
Answer : For the month of June, the cheapest day to fly is Wednesday. Being flexible with your travel days garners even more savings during booking.

Question : Which airline is giving the best deals for round-trip flights from Long Island MacArthur Airport (ISP) to Lambert-St. Louis International Airport (STL)?
Answer : American Airlines is your best bet for finding that coveted low fare. They're offering fares as low as $392, while prices for other flights are as high as $3,372.

Question : Do travelers from Ronkonkoma typically stay in Saint Louis for very long?
Answer : Over the next two months, passengers from ISP to STL are planning on staying for one week on average.

Question : Do prices fluctuate more for this route than others?
Answer : Ranging anywhere from $392 to $3,372, prices for ISP to STL do change much more than the majority of routes in the United States. The further out you book a route, the more likely you are to save.

Question : Looking for the cheapest flight over the next 30 days?
Answer : Since low prices are preferred, look at May 30th. As of May 22nd, it's showing the cheapest ticket sales at $412. That is 55% below the average price for this route, so you can spend that extra money on a fun experience in Saint Louis.

Question : Is there another local airport that can get you to Saint Louis?
Answer : Westchester County Airport is just 37 miles away, and, on average, flights are 50% cheaper for the upcoming months. Save now and put it towards your next adventure.