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

Return flights

09 Dec - 15 Dec	Fiji Airways
25 Dec - 20 Jan	Delta
03 Dec - 15 Dec	Air Canada
03 Dec - 16 Dec	Air Canada
29 Dec - 26 Jan	ANA
09 Dec - 28 Jan	ANA
25 Dec - 13 Jan	Air Canada
25 Dec - 18 Jan	Delta
25 Dec - 17 Jan	Delta
12 Dec - 07 Jan	United
25 Dec - 08 Jan	Air Canada
24 Dec - 06 Jan	United
23 Dec - 15 Jan	United
18 Dec - 31 Dec	Air Canada
15 Dec - 15 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 $1353

Return flights