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

Return flights

24 Sep - 30 Sep	Tunisair
25 Sep - 30 Sep	Tunisair
28 Sep - 04 Oct	Tunisair	direct
27 Sep - 04 Oct	Tunisair	direct
27 Sep - 01 Oct	Tunisair	direct
23 Sep - 01 Oct	Nouvelair
27 Sep - 12 Oct	Tunisair	direct
23 Sep - 30 Sep	Nouvelair
25 Sep - 10 Oct	Tunisair
27 Sep - 10 Oct	Tunisair	direct
23 Sep - 08 Oct	Tunisair	direct
25 Sep - 10 Oct	Tunisair	direct
26 Sep - 30 Sep	Tunisair
23 Sep - 01 Oct	Tunisair	direct
23 Sep - 29 Sep	Nouvelair
19 Sep - 24 Sep	Tunisair	direct
23 Sep - 26 Sep	Tunisair	direct
22 Sep - 29 Sep	Tunisair
22 Sep - 25 Sep	Tunisair
26 Sep - 30 Sep	Tunisair	direct

Also check the deals for one-way flights from Tunis 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 Tunis to Istanbul in September from 202€

Return flights