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

Return flights

08 Sep - 23 Sep	Cathay Pacific
21 Sep - 26 Sep	Sichuan Airlines
12 Sep - 21 Sep	Thai Airways
16 Sep - 26 Sep	Thai Airways
13 Sep - 21 Sep	Thai Airways
13 Sep - 25 Sep	Thai Airways
26 Sep - 27 Sep	Jetstar
25 Sep - 15 Oct	Thai Airways
21 Sep - 25 Sep	Qantas
22 Sep - 24 Oct	Virgin Australia
15 Sep - 20 Oct	Virgin Australia
22 Sep - 09 Oct	Thai Airways
21 Sep - 08 Oct	Thai Airways
21 Sep - 09 Oct	Thai Airways
22 Sep - 11 Oct	Thai Airways
25 Sep - 11 Oct	Thai Airways
26 Sep - 15 Oct	Thai Airways
20 Sep - 08 Oct	Thai Airways
20 Sep - 27 Sep	Emirates

Also check the deals for one-way flights from Sydney to Brussels 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 Brussels in September from $1062

Return flights