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

Return flights

20 Sep - 26 Sep	Avianca
15 Sep - 18 Sep	Avianca
18 Sep - 25 Sep	Avianca
22 Sep - 13 Oct	Avianca
24 Sep - 30 Sep	Avianca
07 Sep - 11 Sep	Copa
07 Sep - 16 Sep	Copa
21 Sep - 26 Sep	Copa
24 Sep - 29 Sep	Avianca
25 Sep - 30 Sep	Avianca
23 Sep - 26 Sep	Avianca
06 Sep - 06 Oct	Copa
20 Sep - 14 Oct	Avianca
25 Sep - 04 Oct	Copa
21 Sep - 04 Oct	Copa
26 Sep - 05 Oct	Copa
14 Sep - 14 Oct	Avianca

Also check the deals for one-way flights from Sao Paulo 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 Sao Paulo to Mexico City in September from 383€

Return flights