AirHint found the following cheapest return flights from Porto (OPO) to Belgrade (BEG) in August 2025 (see full year).

Return flights

31 Aug - 04 Sep	Air Serbia
28 Aug - 31 Aug	Air Serbia
21 Aug - 28 Aug	Air Serbia
24 Aug - 28 Aug	Air Serbia
20 Aug - 31 Aug	Vueling Airlines
21 Aug - 24 Aug	Air Serbia
17 Aug - 28 Aug	Lufthansa
17 Aug - 21 Aug	Air Serbia	direct

Also check the deals for one-way flights from Porto to Belgrade 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 Porto to Belgrade in August from 267€

Return flights