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

Return flights

01 Dec - 10 Dec	Air China
01 Dec - 19 Jan	Air China
09 Dec - 09 Jan	Air China
16 Dec - 13 Jan	Wizz Air
18 Dec - 29 Jan	Wizz Air
12 Dec - 10 Jan	Sichuan Airlines
17 Dec - 10 Jan	Sichuan Airlines
10 Dec - 07 Jan	Sichuan Airlines
16 Dec - 08 Jan	Wizz Air
15 Dec - 16 Jan	Ryanair
17 Dec - 17 Jan	Sichuan Airlines
01 Dec - 08 Dec	Ryanair
01 Dec - 09 Dec	Ryanair
01 Dec - 04 Dec	Ryanair
01 Dec - 13 Dec	Ryanair
01 Dec - 11 Dec	Ryanair
09 Dec - 23 Dec	Pegasus Airlines
16 Dec - 23 Dec	Wizz Air
01 Dec - 15 Dec	Ryanair
07 Dec - 12 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 852€

Return flights