Cheapest return flights from St. Louis to Istanbul in April from $619

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

Return flights

21 Apr - 13 May Air Canada
22 Apr - 13 May Air Canada
27 Apr - 04 May Delta
13 Apr - 20 Apr Delta
20 Apr - 27 Apr Delta
13 Apr - 09 May Delta
06 Apr - 13 Apr Delta
19 Apr - 05 May Lufthansa
18 Apr - 25 Apr Frontier Airlines
10 Apr - 17 Apr Delta

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

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