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

Return flights

24 Sep - 08 Oct	Aeromexico
19 Sep - 07 Oct	Aeromexico
01 Sep - 08 Sep	Viva
02 Sep - 09 Sep	Aeromexico
08 Sep - 15 Sep	Aeromexico
18 Sep - 23 Sep	Aeromexico
11 Sep - 18 Sep	Aeromexico
19 Sep - 14 Oct	Aeromexico
12 Sep - 23 Sep	Aeromexico
12 Sep - 16 Sep	Volaris
05 Sep - 21 Sep	Aeromexico
13 Sep - 19 Sep	Aeromexico
19 Sep - 26 Sep	Aeromexico
18 Sep - 19 Oct	Aeromexico
27 Sep - 11 Oct	Volaris
22 Sep - 12 Oct	Iberia

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 705€

Return flights