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

Return flights

02 Dec - 10 Dec	AJet
12 Dec - 12 Jan	Brussels Airlines
31 Dec - 15 Jan	Turkish Airlines
10 Dec - 18 Jan	Turkish Airlines
18 Dec - 16 Jan	Ryanair
17 Dec - 07 Jan	Hainan Airlines
30 Dec - 23 Jan	Turkish Airlines
11 Dec - 31 Dec	Brussels Airlines
06 Dec - 11 Jan	Turkish Airlines
17 Dec - 03 Jan	Hainan Airlines
18 Dec - 04 Jan	Ryanair
19 Dec - 04 Jan	Turkish Airlines
06 Dec - 07 Dec	Turkish Airlines
13 Dec - 27 Dec	Turkish Airlines
07 Dec - 12 Dec	Qatar Airways
23 Dec - 31 Dec	Cathay Pacific
13 Dec - 31 Dec	Turkish Airlines
10 Dec - 31 Dec	Thai Airways
01 Dec - 22 Dec	Qantas

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 979€

Return flights