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

Return flights

13 Dec - 17 Dec	Arajet
05 Dec - 10 Dec	Aeromexico
06 Dec - 11 Dec	Arajet
12 Dec - 30 Dec	Viva
10 Dec - 31 Dec	Viva
09 Dec - 30 Dec	Viva
11 Dec - 16 Dec	Avianca
04 Dec - 07 Dec	Avianca
15 Dec - 31 Dec	Avianca
04 Dec - 11 Dec	Avianca
31 Dec - 11 Jan	Aeromexico	direct
26 Dec - 02 Jan	Copa
29 Dec - 03 Jan	Copa
30 Dec - 08 Jan	Copa
28 Dec - 04 Jan	Copa
29 Dec - 05 Jan	Copa
26 Dec - 04 Jan	Copa
20 Dec - 04 Jan	Copa
17 Dec - 02 Jan	Copa
26 Dec - 02 Jan	Aeromexico	direct

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 $295

Return flights