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

Return flights

17 Sep - 28 Sep	Air Serbia
17 Sep - 30 Sep	Air Serbia
17 Sep - 27 Sep	Air Serbia
17 Sep - 23 Sep	Air Serbia
29 Sep - 03 Oct	Air Serbia
14 Sep - 20 Sep	Air Serbia
15 Sep - 19 Sep	Air Serbia
10 Sep - 11 Sep	Air Serbia
08 Sep - 19 Sep	Air Serbia
08 Sep - 14 Sep	Air Serbia
06 Sep - 11 Sep	Air Serbia
29 Sep - 11 Oct	Air Serbia
29 Sep - 11 Oct	SWISS	direct
30 Sep - 01 Oct	Air Serbia
27 Sep - 11 Oct	SWISS	direct
28 Sep - 11 Oct	SWISS	direct
27 Sep - 03 Oct	Air Serbia
30 Sep - 01 Oct	SWISS	direct

Also check the deals for one-way flights from Zurich 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 Zurich to Ljubljana in September from $204

Return flights