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

Return flights

25 Sep - 07 Oct	Viva
25 Sep - 29 Sep	Viva
24 Sep - 29 Sep	Viva
17 Sep - 30 Sep	Volaris
22 Sep - 10 Oct	Volaris
18 Sep - 30 Sep	Viva
19 Sep - 07 Oct	Viva
20 Sep - 27 Sep	Viva
18 Sep - 24 Sep	Viva
13 Sep - 19 Sep	Viva
19 Sep - 26 Sep	Viva
18 Sep - 19 Oct	Viva
05 Sep - 19 Sep	Volaris
12 Sep - 23 Sep	Arajet
06 Sep - 17 Oct	Air Canada

Also check the deals for one-way flights from Mexico City to Lisbon 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 Lisbon in September from $874

Return flights