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

Return flights

17 Sep - 21 Sep	easyJet
11 Sep - 14 Sep	easyJet
11 Sep - 17 Sep	easyJet
25 Sep - 28 Sep	easyJet
18 Sep - 21 Sep	Ryanair
22 Sep - 26 Sep	easyJet
04 Sep - 07 Sep	Vueling Airlines
14 Sep - 22 Sep	easyJet
01 Sep - 07 Sep	TAP
04 Sep - 04 Sep	Air Serbia
28 Sep - 02 Oct	TAP

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

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 September from 128€

Return flights