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

Return flights

30 Aug - 02 Sep	Croatia Airlines	direct
14 Aug - 16 Aug	Air Serbia
07 Aug - 10 Aug	Austrian Airlines
01 Aug - 03 Aug	Austrian Airlines
18 Aug - 25 Aug	Ryanair
15 Aug - 17 Aug	Austrian Airlines
02 Aug - 10 Aug	Air Serbia
14 Aug - 16 Aug	Croatia Airlines	direct
14 Aug - 25 Aug	Austrian Airlines

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 $153

Return flights