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

Return flights

26 Aug - 03 Sep	SWISS
30 Aug - 06 Sep	SWISS
25 Aug - 29 Aug	SWISS
27 Aug - 30 Aug	Lufthansa
28 Aug - 30 Aug	Lufthansa
27 Aug - 01 Sep	Lufthansa
18 Aug - 22 Aug	Air Serbia
18 Aug - 25 Aug	Air Serbia
24 Aug - 30 Aug	Lufthansa
31 Aug - 05 Sep	SWISS
18 Aug - 21 Aug	Air Serbia
17 Aug - 20 Aug	Air Serbia
17 Aug - 21 Aug	Air Serbia
20 Aug - 08 Sep	Air Serbia
26 Aug - 29 Aug	Air Serbia

Also check the deals for one-way flights from Ljubljana to Barcelona in August.

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 August from 201€

Return flights