AirHint found the following cheapest return flights from Constantine (CZL) to Istanbul (IST) in October 2025 (see full year).

Return flights

15 Oct - 22 Oct	Turkish Airlines	direct
03 Oct - 13 Oct	Turkish Airlines	direct
01 Oct - 10 Oct	Turkish Airlines	direct
14 Oct - 21 Oct	Transavia France
08 Oct - 19 Oct	Transavia France
14 Oct - 19 Oct	Transavia France

Also check the deals for one-way flights from Constantine to Istanbul in October.

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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Cheapest return flights from Constantine to Istanbul in October from $288

Return flights