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

Return flights

24 Sep - 26 Sep	AZAL
24 Sep - 29 Sep	AZAL
19 Sep - 26 Sep	AZAL
19 Sep - 27 Sep	AZAL
20 Sep - 27 Sep	AZAL
27 Sep - 29 Sep	AZAL
27 Sep - 18 Oct	AZAL
25 Sep - 16 Oct	AZAL
24 Sep - 02 Oct	AZAL
29 Sep - 10 Oct	AZAL
25 Sep - 02 Oct	AZAL
27 Sep - 04 Oct	AZAL
30 Sep - 04 Oct	Pegasus Airlines
26 Sep - 10 Oct	Pegasus Airlines
19 Sep - 20 Sep	AZAL
20 Sep - 04 Oct	AZAL
22 Sep - 06 Oct	Pegasus Airlines
24 Sep - 28 Sep	Pegasus Airlines	direct
24 Sep - 26 Sep	Pegasus Airlines	direct
25 Sep - 28 Sep	Pegasus Airlines	direct

Also check the deals for one-way flights from Istanbul to Tehran 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 Istanbul to Tehran in September from 70€

Return flights