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

Return flights

20 Sep - 24 Sep	Norwegian
20 Sep - 22 Sep	Norwegian
06 Sep - 08 Sep	Norwegian	direct
20 Sep - 23 Sep	Norwegian
03 Sep - 08 Sep	Norwegian	direct
21 Sep - 24 Sep	Air Serbia	direct
01 Sep - 12 Sep	Norwegian
24 Sep - 28 Sep	Norwegian
06 Sep - 20 Sep	Norwegian	direct
20 Sep - 22 Sep	Norwegian	direct
20 Sep - 04 Oct	Norwegian	direct
15 Sep - 04 Oct	Norwegian	direct

Also check the deals for one-way flights from Oslo 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 Oslo to Belgrade in September from 125€

Return flights