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

Return flights

23 Sep - 10 Oct	Air Serbia
02 Sep - 05 Sep	Air Serbia
24 Sep - 28 Sep	Turkish Airlines	direct
10 Sep - 15 Sep	AJet
25 Sep - 28 Sep	Air Serbia
18 Sep - 24 Sep	Turkish Airlines	direct
10 Sep - 15 Sep	Turkish Airlines	direct
02 Sep - 05 Sep	Turkish Airlines	direct
13 Sep - 06 Oct	Air Serbia
23 Sep - 10 Oct	Turkish Airlines	direct
02 Sep - 09 Sep	Turkish Airlines	direct
03 Sep - 06 Sep	Turkish Airlines	direct
05 Sep - 18 Sep	Turkish Airlines	direct
13 Sep - 06 Oct	Turkish Airlines	direct

Also check the deals for one-way flights from Istanbul to Ljubljana 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 Istanbul to Ljubljana in September from 199€

Return flights