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

One-Way flights

22 Sep	Nouvelair
30 Sep	Nouvelair	direct
28 Sep	Nouvelair	direct
26 Sep	Nouvelair	direct
15 Sep	Transavia France
13 Sep	Transavia France
09 Sep	Tunisair
04 Sep	Vueling Airlines
08 Sep	Nouvelair
17 Sep	Transavia France

Also check the deals for return 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 one-way flights from Tunis to Istanbul in September from $137

One-Way flights