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

Return flights

18 Sep - 23 Sep	Aeromexico
11 Sep - 15 Sep	Copa
27 Sep - 29 Sep	Copa
21 Sep - 25 Sep	Copa
24 Sep - 28 Sep	Copa
07 Sep - 13 Sep	Copa
06 Sep - 10 Sep	Copa
10 Sep - 14 Sep	Copa
10 Sep - 16 Sep	Copa
09 Sep - 12 Sep	Copa
26 Sep - 03 Oct	Copa
27 Sep - 03 Oct	Copa
27 Sep - 04 Oct	Copa
30 Sep - 03 Oct	Copa
29 Sep - 06 Oct	Copa
27 Sep - 05 Oct	Copa
10 Sep - 01 Oct	Copa
20 Sep - 05 Oct	Copa
25 Sep - 02 Oct	Copa
03 Sep - 12 Oct	Copa

Also check the deals for one-way flights from Sao Paulo to Cancun 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 Cancun in September from $437

Return flights