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

Return flights

28 Aug - 02 Sep	Air Serbia
28 Aug - 01 Sep	Air Serbia
31 Aug - 03 Sep	Air Serbia
31 Aug - 04 Sep	Air Serbia
27 Aug - 01 Sep	Vueling Airlines
31 Aug - 02 Sep	Air Serbia
21 Aug - 25 Aug	Air Serbia
28 Aug - 31 Aug	Air Serbia
24 Aug - 28 Aug	easyJet
28 Aug - 31 Aug	Air Serbia	direct
22 Aug - 26 Aug	TAP
21 Aug - 28 Aug	Air Serbia
21 Aug - 24 Aug	Air Serbia	direct
20 Aug - 31 Aug	Vueling Airlines
31 Aug - 31 Aug	SWISS

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 $300

Return flights