AirHint found the following cheapest return flights from Cork (ORK) to Istanbul (IST) in September 2025 (see full year).

Return flights

15 Sep - 29 Sep	Ryanair
09 Sep - 17 Sep	Ryanair
24 Sep - 30 Sep	Ryanair
26 Sep - 30 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
12 Sep - 17 Sep	Ryanair
07 Sep - 13 Sep	Ryanair
01 Sep - 05 Sep	Ryanair
02 Sep - 05 Sep	Ryanair
03 Sep - 05 Sep	Ryanair

Also check the deals for one-way flights from Cork to Istanbul in September.

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 Cork to Istanbul in September from $195

Return flights