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

Return flights

28 Sep - 30 Sep	Air Serbia
29 Sep - 03 Oct	Air Serbia
28 Sep - 03 Oct	Air Serbia
28 Sep - 04 Oct	Air Serbia
30 Sep - 04 Oct	Air Serbia
29 Sep - 02 Oct	Air Serbia
28 Sep - 02 Oct	Air Serbia
26 Sep - 30 Sep	Air Serbia
23 Sep - 26 Sep	Transavia France
27 Sep - 30 Sep	Eurowings
26 Sep - 29 Sep	Air Serbia
18 Sep - 22 Sep	Air Serbia
16 Sep - 18 Sep	Air Serbia
21 Sep - 26 Sep	Air Serbia
17 Sep - 19 Sep	Air Serbia
22 Sep - 27 Sep	Air Serbia
25 Sep - 02 Oct	Air Serbia
25 Sep - 03 Oct	Eurowings
27 Sep - 02 Oct	Brussels Airlines

Also check the deals for one-way flights from Ljubljana to Barcelona 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 Barcelona in September from $164

Return flights