AirHint found the following cheapest return flights from Split (SPU) to Osijek (OSI) in August 2025 (see full year).

Return flights

29 Aug - 05 Sep	Croatia Airlines	direct
29 Aug - 29 Aug	Croatia Airlines	direct
25 Aug - 28 Aug	Trade Air
29 Aug - 31 Aug	Croatia Airlines
24 Aug - 25 Aug	Croatia Airlines
31 Aug - 02 Sep	Croatia Airlines
25 Aug - 26 Aug	Trade Air
22 Aug - 24 Aug	Croatia Airlines
22 Aug - 25 Aug	Croatia Airlines
15 Aug - 18 Aug	Croatia Airlines
18 Aug - 18 Aug	Croatia Airlines
15 Aug - 22 Aug	Trade Air

Also check the deals for one-way flights from Split to Osijek 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 Split to Osijek in August from 132€

Return flights