AirHint found the following cheapest return flights from Kolkata (CCU) to Istanbul (IST) in October 2025 (see full year).
Return flights
| 28 Oct - 04 Nov | IndiGo | ||
| 27 Oct - 03 Nov | IndiGo | ||
| 25 Oct - 09 Nov | IndiGo |
Also check the deals for one-way flights from Kolkata to Istanbul in October.
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