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

Return flights

03 Dec - 20 Dec	Norwegian	direct
01 Dec - 03 Dec	Air Serbia	direct
31 Dec - 25 Jan	Austrian Airlines
14 Dec - 04 Jan	Air Serbia
14 Dec - 03 Jan	Lufthansa
29 Dec - 03 Jan	Austrian Airlines
12 Dec - 04 Jan	Air Serbia
25 Dec - 28 Dec	LOT
29 Dec - 10 Jan	Norwegian	direct
29 Dec - 03 Jan	Norwegian	direct
20 Dec - 29 Dec	Norwegian	direct
20 Dec - 27 Dec	Norwegian	direct
20 Dec - 03 Jan	Norwegian	direct

Also check the deals for one-way flights from Oslo 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 Oslo to Belgrade in December from 122€

Return flights