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

Return flights

12 Sep - 19 Sep	Jetstar
25 Sep - 30 Sep	Philippine Airlines
26 Sep - 28 Sep	Delta
30 Sep - 07 Oct	Philippine Airlines
28 Sep - 05 Oct	Delta
26 Sep - 29 Sep	Delta
03 Sep - 14 Sep	ANA
17 Sep - 25 Sep	Delta
24 Sep - 01 Oct	Delta
16 Sep - 21 Sep	Delta
29 Sep - 06 Oct	Qantas
26 Sep - 10 Oct	Qantas

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 1033€

Return flights