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

Return flights

17 Sep - 20 Sep	Air Serbia
15 Sep - 20 Sep	Air Serbia
12 Sep - 20 Sep	Air Serbia
11 Sep - 16 Sep	Air Serbia
02 Sep - 09 Sep	Air Serbia
29 Sep - 04 Oct	Air Serbia
25 Sep - 08 Oct	Air Serbia
29 Sep - 06 Oct	Wizz Air
20 Sep - 23 Sep	Air Serbia
27 Sep - 01 Oct	Eurowings
05 Sep - 09 Sep	Norwegian Air Sweden AOC
16 Sep - 20 Sep	Air Serbia
17 Sep - 25 Sep	Air Serbia
24 Sep - 27 Sep	Air Serbia
28 Sep - 01 Oct	Air Serbia
25 Sep - 08 Oct	Turkish Airlines	direct
29 Sep - 06 Oct	Turkish Airlines	direct
27 Sep - 01 Oct	Turkish Airlines	direct
25 Sep - 02 Oct	Turkish Airlines	direct
29 Sep - 05 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 185€

Return flights