Cheapest return flights from Louisville to Istanbul in April from $638

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

Return flights

06 Apr - 15 Apr Delta
01 Apr - 15 Apr Delta
01 Apr - 14 Apr Delta
06 Apr - 11 May Delta
04 Apr - 15 Apr Delta
04 Apr - 14 Apr Delta
22 Apr - 29 Apr Lufthansa
11 Apr - 19 Apr Delta
04 Apr - 13 Apr Delta
01 Apr - 12 Apr Delta
02 Apr - 14 Apr Lufthansa

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

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