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

Return flights

08 Sep - 15 Sep	Norwegian	direct
08 Sep - 29 Sep	Norwegian	direct
01 Sep - 15 Sep	Norwegian	direct
01 Sep - 03 Sep	Norwegian	direct
03 Sep - 15 Sep	Norwegian	direct
01 Sep - 06 Sep	Norwegian	direct
19 Sep - 24 Sep	Air Serbia	direct
03 Sep - 06 Sep	Norwegian	direct
04 Sep - 08 Sep	Air Serbia	direct
03 Sep - 07 Sep	Norwegian	direct

Also check the deals for one-way flights from Belgrade to Oslo 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 Belgrade to Oslo in September from 131€

Return flights