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

Return flights

04 Dec - 09 Dec	Frontier Airlines
05 Dec - 08 Dec	Frontier Airlines
12 Dec - 15 Dec	Frontier Airlines
10 Dec - 14 Dec	Frontier Airlines
11 Dec - 22 Dec	Frontier Airlines
16 Dec - 23 Dec	Frontier Airlines
24 Dec - 29 Dec	Frontier Airlines
17 Dec - 23 Dec	Hawaiian Airlines
27 Dec - 07 Jan	Hawaiian Airlines
19 Dec - 26 Dec	Frontier Airlines
20 Dec - 23 Dec	Hawaiian Airlines
29 Dec - 02 Jan	Frontier Airlines
27 Dec - 01 Jan	Alaska Airlines
28 Dec - 02 Jan	Frontier Airlines
21 Dec - 03 Jan	Frontier Airlines
24 Dec - 03 Jan	Delta

Also check the deals for one-way flights from San Diego to Mexico City 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 San Diego to Mexico City in December from $346

Return flights