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

Return flights

10 Sep - 17 Sep	Eurowings	direct
25 Sep - 29 Sep	Air Serbia	direct
17 Sep - 18 Sep	Eurowings
17 Sep - 22 Sep	Eurowings
20 Sep - 28 Sep	Eurowings
20 Sep - 22 Sep	Eurowings
17 Sep - 21 Sep	Eurowings
22 Sep - 25 Sep	Air Serbia	direct
19 Sep - 27 Sep	Eurowings
26 Sep - 29 Sep	Eurowings
27 Sep - 01 Oct	Eurowings	direct
28 Sep - 01 Oct	Air Serbia	direct
14 Sep - 14 Oct	Air Serbia	direct
29 Sep - 04 Oct	Air Serbia	direct

Also check the deals for one-way flights from Duesseldorf 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 Duesseldorf to Belgrade in September from $138

Return flights