AirHint found the following cheapest return flights from Zagreb (ZAG) to Bucharest (OTP) in August 2025 (see full year).

Return flights

30 Aug - 04 Sep	Croatia Airlines	direct
14 Aug - 16 Aug	Air Serbia
06 Aug - 08 Aug	Air Serbia
11 Aug - 13 Aug	Ryanair
12 Aug - 22 Aug	Austrian Airlines
12 Aug - 14 Aug	Ryanair
26 Aug - 31 Aug	Lufthansa
13 Aug - 19 Aug	Ryanair
16 Aug - 23 Aug	LOT
13 Aug - 20 Aug	LOT
17 Aug - 24 Aug	LOT

Also check the deals for one-way flights from Zagreb to Bucharest 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 Zagreb to Bucharest in August from 131€

Return flights