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

Return flights

29 Sep - 06 Oct	Wizz Air
22 Sep - 25 Sep	Air Serbia
27 Sep - 30 Sep	Transavia France
26 Sep - 28 Sep	Lufthansa
20 Sep - 23 Sep	SWISS
09 Sep - 13 Sep	SWISS
17 Sep - 21 Sep	SWISS
24 Sep - 28 Sep	SWISS
01 Sep - 06 Sep	SWISS
09 Sep - 16 Sep	SWISS
20 Sep - 21 Sep	SWISS
27 Sep - 05 Oct	Eurowings

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 169€

Return flights