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

Return flights

01 Dec - 22 Dec	Turkish Airlines
01 Dec - 05 Dec	Turkish Airlines
31 Dec - 23 Jan	Turkish Airlines
05 Dec - 21 Dec	Turkish Airlines
02 Dec - 30 Dec	Turkish Airlines
02 Dec - 29 Dec	Turkish Airlines
11 Dec - 10 Jan	Turkish Airlines
27 Dec - 15 Jan	Turkish Airlines
27 Dec - 22 Jan	Turkish Airlines
24 Dec - 30 Dec	Qatar Airways
22 Dec - 10 Jan	Turkish Airlines
18 Dec - 10 Jan	Turkish Airlines
22 Dec - 01 Jan	Turkish Airlines
19 Dec - 04 Jan	Turkish Airlines
20 Dec - 02 Jan	Cathay Pacific
20 Dec - 01 Jan	Emirates

Also check the deals for one-way flights from Brussels to Sydney in December.

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 Brussels to Sydney in December from $1178

Return flights