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

Return flights

18 Sep - 22 Sep	Finnair
04 Sep - 08 Sep	Norwegian Air Sweden AOC
14 Sep - 19 Sep	Finnair
04 Sep - 09 Sep	Norwegian Air Sweden AOC
23 Sep - 30 Sep	Finnair
11 Sep - 18 Sep	Norwegian Air Sweden AOC
04 Sep - 12 Sep	Norwegian Air Sweden AOC
16 Sep - 18 Sep	Scandinavian Airlines
14 Sep - 18 Sep	Scandinavian Airlines
07 Sep - 11 Sep	Norwegian Air Sweden AOC

Also check the deals for one-way flights from Helsinki 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 Helsinki to Belgrade in September from $158

Return flights