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

Return flights

24 Aug - 01 Sep	Air Serbia
12 Aug - 20 Aug	Vueling Airlines
22 Aug - 28 Aug	Norwegian
21 Aug - 14 Sep	Ryanair
21 Aug - 14 Sep	Air Serbia	direct
23 Aug - 29 Aug	Vueling Airlines
21 Aug - 28 Aug	Lufthansa
24 Aug - 28 Aug	Air Serbia
10 Aug - 21 Aug	Air Serbia
24 Aug - 28 Aug	Air Serbia	direct
08 Aug - 17 Aug	Ryanair
21 Aug - 28 Aug	Air Serbia	direct
10 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 235€

Return flights