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

Return flights

29 Sep - 04 Oct	Air Serbia
29 Sep - 05 Oct	Air Serbia
29 Sep - 01 Oct	Air Serbia
23 Sep - 05 Oct	Air Serbia
22 Sep - 30 Sep	Air Serbia
18 Sep - 23 Sep	Air Serbia
28 Sep - 04 Oct	Air Serbia
25 Sep - 04 Oct	Air Serbia
23 Sep - 26 Sep	Air Serbia
18 Sep - 20 Sep	Air Serbia
29 Sep - 03 Oct	Air Serbia
26 Sep - 07 Oct	Air Serbia
22 Sep - 01 Oct	Wizz Air
26 Sep - 30 Sep	Wizz Air
27 Sep - 29 Sep	Air Serbia
22 Sep - 29 Sep	Air Serbia
16 Sep - 20 Sep	Air Serbia
23 Sep - 28 Sep	Air Serbia
25 Sep - 29 Sep	Air Serbia
27 Sep - 02 Oct	Air Serbia

Also check the deals for one-way flights from Ljubljana 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 Ljubljana to Istanbul in September from 155€

Return flights