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

Return flights

16 Sep - 28 Sep	Wizz Air Malta
11 Sep - 14 Sep	Vueling Airlines
09 Sep - 16 Sep	SWISS
19 Sep - 23 Sep	SWISS
14 Sep - 20 Sep	SWISS
14 Sep - 23 Sep	SWISS
12 Sep - 17 Sep	SWISS
16 Sep - 23 Sep	SWISS
23 Sep - 30 Sep	SWISS
12 Sep - 20 Sep	SWISS
26 Sep - 05 Oct	Air Serbia
28 Sep - 05 Oct	Air Serbia
30 Sep - 03 Oct	Wizz Air Malta
28 Sep - 04 Oct	SWISS
30 Sep - 02 Oct	Wizz Air Malta
27 Sep - 05 Oct	Vueling Airlines
28 Sep - 03 Oct	Air Serbia

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

Return flights