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

Return flights

07 Dec - 16 Jan	Viva
24 Dec - 08 Jan	Viva
25 Dec - 10 Jan	Viva
01 Dec - 14 Dec	ANA
29 Dec - 21 Jan	Qantas
25 Dec - 04 Jan	Viva
28 Dec - 18 Jan	Qantas
23 Dec - 06 Jan	Viva
25 Dec - 11 Jan	Qantas
12 Dec - 19 Jan	Emirates
20 Dec - 30 Dec	Viva
20 Dec - 06 Jan	Viva

Also check the deals for one-way flights from Mexico City 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 Mexico City to Sydney in December from $1471

Return flights