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

Return flights

03 Dec - 08 Dec	Volaris
01 Dec - 08 Dec	Volaris
04 Dec - 13 Dec	Mexicana
30 Dec - 10 Jan	Viva
26 Dec - 10 Jan	Viva
10 Dec - 13 Dec	Viva
24 Dec - 08 Jan	Viva
17 Dec - 09 Jan	Aeromexico
16 Dec - 06 Jan	Hainan Airlines
20 Dec - 07 Jan	Viva
15 Dec - 05 Jan	Hainan Airlines
12 Dec - 19 Jan	United
12 Dec - 15 Dec	Aeromexico
08 Dec - 14 Dec	Qantas
07 Dec - 14 Dec	Qantas
20 Dec - 03 Jan	Viva
15 Dec - 21 Dec	United

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.

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Cheapest return flights from Mexico City to Sydney in December from $1362

Return flights