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

Return flights

28 Aug - 11 Sep	SWISS
21 Aug - 24 Aug	Air Serbia
14 Aug - 20 Aug	Air Serbia
14 Aug - 21 Aug	SWISS
28 Aug - 06 Sep	SWISS
29 Aug - 06 Sep	SWISS
30 Aug - 06 Sep	Air France
29 Aug - 07 Sep	Air Serbia
30 Aug - 07 Sep	airBaltic
06 Aug - 10 Aug	airBaltic
09 Aug - 17 Aug	airBaltic
07 Aug - 11 Aug	SWISS
09 Aug - 16 Aug	LOT

Also check the deals for one-way flights from Oslo to Ljubljana 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 Oslo to Ljubljana in August from 229€

Return flights