AirHint found the following cheapest return flights from Istanbul (IST) to Zagreb (ZAG) in September 2026 (see full year).
Return flights
| 27 Sep - 10 Oct | Turkish Airlines | direct | |
| 01 Sep - 12 Oct | LOT | ||
| 01 Sep - 12 Oct | Turkish Airlines | direct |
Also check the deals for one-way flights from Istanbul to Zagreb in September.
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