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

Return flights

10 Sep - 13 Sep	AZAL
08 Sep - 15 Sep	AZAL
03 Sep - 08 Sep	AZAL
04 Sep - 12 Sep	AZAL
03 Sep - 06 Sep	AZAL
01 Sep - 08 Sep	AZAL
01 Sep - 04 Sep	AZAL
04 Sep - 11 Sep	AZAL
05 Sep - 13 Sep	AZAL
01 Sep - 05 Sep	AZAL
30 Sep - 05 Oct	Pegasus Airlines	direct
28 Sep - 05 Oct	Pegasus Airlines	direct
06 Sep - 31 Oct	Pegasus Airlines	direct
27 Sep - 27 Oct	AZAL
26 Sep - 27 Oct	AZAL
27 Sep - 27 Oct	Turkish Airlines	direct
26 Sep - 27 Oct	Turkish 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 48€

Return flights