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

Return flights

11 Dec - 30 Jan	Air China
03 Dec - 31 Jan	Air China
07 Dec - 15 Jan	China Eastern
03 Dec - 07 Dec	Air China
04 Dec - 07 Dec	Air China
30 Dec - 16 Jan	China Southern
30 Dec - 19 Jan	China Southern
30 Dec - 21 Jan	China Southern
10 Dec - 10 Jan	Sichuan Airlines
01 Dec - 09 Dec	Sichuan Airlines
06 Dec - 09 Dec	Air China
05 Dec - 12 Dec	Air China
30 Dec - 22 Jan	China Southern
01 Dec - 08 Dec	Sichuan Airlines
01 Dec - 07 Dec	Sichuan Airlines
08 Dec - 12 Dec	Air China
17 Dec - 16 Jan	Etihad Airways
07 Dec - 14 Dec	Air China
11 Dec - 15 Jan	Etihad Airways
07 Dec - 16 Dec	Air China

Also check the deals for one-way flights from Madrid 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 Madrid to Sydney in December from 720€

Return flights