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

Return flights

04 Dec - 11 Dec	Air Serbia	direct
11 Dec - 14 Dec	Air Serbia
05 Dec - 07 Dec	Air Serbia
05 Dec - 07 Dec	Air Serbia	direct
31 Dec - 07 Jan	KLM
25 Dec - 31 Dec	LOT
22 Dec - 28 Dec	Ryanair
28 Dec - 05 Jan	Austrian Airlines
29 Dec - 06 Jan	Lufthansa
24 Dec - 04 Jan	LOT
17 Dec - 04 Jan	LOT
22 Dec - 22 Dec	Scandinavian Airlines
22 Dec - 28 Dec	Air Serbia	direct
31 Dec - 07 Jan	Norwegian	direct
22 Dec - 04 Jan	Ryanair
26 Dec - 04 Jan	Austrian Airlines
24 Dec - 27 Dec	Norwegian	direct
20 Dec - 22 Dec	Norwegian	direct
20 Dec - 02 Jan	Lufthansa
26 Dec - 04 Jan	Air Serbia	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 $129

Return flights