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

Return flights

02 Dec - 31 Dec	Iberia
28 Dec - 20 Jan	Iberia
05 Dec - 23 Dec	Iberia
22 Dec - 31 Dec	Iberia
17 Dec - 31 Dec	Iberia
05 Dec - 21 Dec	Iberia
28 Dec - 10 Jan	Iberia
25 Dec - 31 Dec	Iberia
11 Dec - 29 Dec	KLM
24 Dec - 02 Jan	Iberia
22 Dec - 06 Jan	Iberia
24 Dec - 06 Jan	Iberia
25 Dec - 04 Jan	Iberia
19 Dec - 31 Dec	KLM

Also check the deals for one-way flights from Mexico City to Lisbon in December.

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 December from $814

Return flights