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

Return flights

13 Dec - 10 Jan	Wizz Air Malta
14 Dec - 11 Jan	Iberia
27 Dec - 17 Jan	Iberia Express
17 Dec - 31 Jan	Wizz Air Malta
29 Dec - 18 Jan	Iberia Express
25 Dec - 10 Jan	Iberia
01 Dec - 07 Dec	Ryanair
04 Dec - 04 Jan	Aegean Airlines
01 Dec - 14 Dec	Ryanair
04 Dec - 14 Dec	Aegean Airlines
10 Dec - 14 Dec	Ryanair
18 Dec - 10 Jan	ITA Airways
04 Dec - 05 Jan	SKY express
19 Dec - 31 Jan	Sichuan Airlines
05 Dec - 14 Dec	Sichuan Airlines
03 Dec - 23 Dec	Ryanair
02 Dec - 18 Dec	Ryanair
06 Dec - 14 Dec	Wizz Air Malta
05 Dec - 17 Dec	Air China
01 Dec - 15 Dec	Ryanair

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 $1136

Return flights