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

Return flights

12 Dec - 15 Dec	Air Serbia	direct
05 Dec - 08 Dec	Air Serbia	direct
08 Dec - 12 Dec	Air Serbia	direct
11 Dec - 15 Dec	Vueling Airlines
08 Dec - 14 Dec	Air Serbia
10 Dec - 14 Dec	Vueling Airlines
09 Dec - 13 Dec	Vueling Airlines
09 Dec - 11 Dec	Ryanair
04 Dec - 08 Jan	Lufthansa
23 Dec - 03 Jan	Vueling Airlines

Also check the deals for one-way flights from Porto to Belgrade in December.

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 December from 108€

Return flights