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

Return flights

05 Dec - 31 Dec	Hawaiian Airlines
11 Dec - 12 Jan	Air Canada
27 Dec - 20 Jan	Fiji Airways
28 Dec - 10 Jan	Fiji Airways
01 Dec - 11 Dec	Air Canada
01 Dec - 08 Dec	Air Canada
06 Dec - 13 Dec	Air Canada
12 Dec - 08 Jan	Hawaiian Airlines
01 Dec - 18 Dec	Air Canada
01 Dec - 10 Dec	Air Canada
31 Dec - 11 Jan	Delta
15 Dec - 22 Jan	Jetstar
04 Dec - 07 Jan	United
27 Dec - 05 Jan	Delta
07 Dec - 07 Jan	United
12 Dec - 27 Dec	United
21 Dec - 28 Dec	Hawaiian Airlines
22 Dec - 29 Dec	United
23 Dec - 18 Jan	United
12 Dec - 20 Dec	United

Also check the deals for one-way flights from Sydney to Mexico City 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 Sydney to Mexico City in December from 1241€

Return flights