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

Return flights

10 Sep - 17 Sep	Iberia
29 Sep - 13 Oct	Iberia
18 Sep - 04 Oct	Viva
09 Sep - 20 Sep	Iberia
27 Sep - 04 Oct	Viva
03 Sep - 23 Sep	Viva
02 Sep - 24 Sep	Iberia
18 Sep - 26 Sep	Iberia
19 Sep - 26 Sep	Iberia
21 Sep - 25 Sep	Iberia
03 Sep - 14 Sep	Viva
11 Sep - 21 Sep	Iberia
01 Sep - 30 Sep	Iberia
12 Sep - 07 Oct	Iberia

Also check the deals for one-way flights from Mexico City to Porto 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 Mexico City to Porto in September from $888

Return flights