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

Return flights

11 Sep - 13 Sep	Air Serbia
18 Sep - 20 Sep	Air Serbia
19 Sep - 20 Sep	Air Serbia
12 Sep - 13 Sep	Air Serbia
25 Sep - 28 Sep	Air Serbia
29 Sep - 06 Oct	Air Serbia
16 Sep - 18 Sep	Air Serbia
29 Sep - 06 Oct	SWISS	direct
25 Sep - 28 Sep	SWISS	direct
30 Sep - 03 Oct	SWISS	direct
30 Sep - 04 Oct	SWISS	direct
09 Sep - 11 Sep	Air Serbia
18 Sep - 22 Sep	Air Serbia
23 Sep - 01 Oct	SWISS	direct
18 Sep - 20 Sep	SWISS	direct

Also check the deals for one-way flights from Ljubljana to Zurich 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 Zurich in September from 156€

Return flights