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

Return flights

04 Dec - 10 Dec	Viva
04 Dec - 12 Dec	Viva
05 Dec - 08 Dec	Aeromexico
05 Dec - 12 Dec	Viva
31 Dec - 14 Jan	Viva
05 Dec - 09 Dec	Volaris
03 Dec - 10 Dec	Arajet
02 Dec - 09 Dec	Volaris
03 Dec - 06 Dec	Viva
09 Dec - 16 Dec	Viva
06 Dec - 07 Dec	Arajet
27 Dec - 04 Jan	Copa
18 Dec - 10 Jan	Copa
18 Dec - 03 Jan	Copa
19 Dec - 04 Jan	Copa
30 Dec - 04 Jan	Copa
29 Dec - 04 Jan	Copa
31 Dec - 12 Jan	Viva
28 Dec - 02 Jan	Copa
29 Dec - 10 Jan	Copa

Also check the deals for one-way flights from Mexico City to San Juan 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 San Juan in December from 322€

Return flights