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

Return flights

25 Sep - 28 Sep	Tunisair
20 Sep - 24 Sep	Air France
22 Sep - 25 Sep	Nouvelair
18 Sep - 24 Sep	Air France
25 Sep - 02 Oct	Tunisair
30 Sep - 15 Oct	Nouvelair	direct
24 Sep - 14 Oct	Nouvelair	direct
22 Sep - 02 Oct	Nouvelair
23 Sep - 25 Sep	Tunisair
19 Sep - 24 Sep	Air France
17 Sep - 24 Sep	Air France
16 Sep - 24 Sep	Air France
18 Sep - 28 Sep	Tunisair
25 Sep - 15 Oct	Nouvelair	direct
28 Sep - 04 Oct	Tunisair	direct
28 Sep - 05 Oct	Tunisair	direct
18 Sep - 20 Sep	Tunisair	direct
29 Sep - 13 Oct	Tunisair	direct
23 Sep - 02 Oct	Nouvelair	direct
30 Sep - 04 Oct	Nouvelair	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 $232

Return flights