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

Return flights

10 Sep - 17 Sep	Jetstar
09 Sep - 23 Sep	Delta
06 Sep - 24 Sep	Delta
05 Sep - 22 Sep	Delta
06 Sep - 21 Sep	Delta
06 Sep - 22 Sep	Delta
05 Sep - 20 Sep	Delta
06 Sep - 20 Sep	Delta
24 Sep - 29 Oct	Delta
04 Sep - 20 Sep	Delta
04 Sep - 21 Sep	Delta
15 Sep - 01 Oct	United

Also check the deals for one-way flights from Sydney to Mexico City in September.

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 September from 919€

Return flights