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

Return flights

23 Jun - 25 Jun	Ryanair
25 Jun - 26 Jun	Ryanair
25 Jun - 27 Jun	Ryanair
16 Jun - 18 Jun	Ryanair
24 Jun - 26 Jun	Ryanair
25 Jun - 28 Jun	Ryanair
26 Jun - 30 Jun	Air Serbia
11 Jun - 13 Jun	Ryanair
26 Jun - 29 Jun	Ryanair
19 Jun - 22 Jun	Air Serbia
26 Jun - 01 Jul	Austrian Airlines

Also check the deals for one-way flights from Zagreb to Bucharest in June.

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 June from 137€

Return flights