Cheapest return flights from St. Louis to Istanbul in March from $689

AirHint found the following cheapest return flights from St. Louis (STL) to Istanbul (IST) in March 2026 (see full year).

Return flights

30 Mar - 06 Apr Delta
11 Mar - 01 Apr Lufthansa
21 Mar - 25 Mar Frontier Airlines
21 Mar - 03 Apr Frontier Airlines
20 Mar - 24 Mar Frontier Airlines
22 Mar - 04 Apr Air France
21 Mar - 04 Apr Frontier Airlines
21 Mar - 28 Mar Frontier Airlines
14 Mar - 04 Apr Frontier Airlines

Also check the deals for one-way flights from St. Louis to Istanbul in March.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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