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

Return flights

16 Sep - 29 Sep	VietJet Air
16 Sep - 28 Sep	VietJet Air
16 Sep - 16 Oct	VietJet Air
16 Sep - 01 Oct	VietJet Air
16 Sep - 02 Oct	VietJet Air
15 Sep - 13 Oct	Cebu Pacific
19 Sep - 28 Sep	Scoot
19 Sep - 29 Sep	Scoot
22 Sep - 28 Sep	VietJet Air
17 Sep - 28 Sep	Vietnam Airlines
17 Sep - 29 Sep	VietJet Air
16 Sep - 11 Oct	VietJet Air
19 Sep - 01 Oct	Scoot
22 Sep - 29 Sep	VietJet Air
19 Sep - 02 Oct	Scoot
16 Sep - 30 Sep	VietJet Air
18 Sep - 28 Sep	Hainan Airlines
16 Sep - 04 Oct	VietJet Air
29 Sep - 13 Oct	VietJet Air
22 Sep - 01 Oct	VietJet Air

Also check the deals for one-way flights from Sydney 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 Sydney to Belgrade in September from 1065€

Return flights