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

Return flights

06 Dec - 08 Jan	Arajet
06 Dec - 09 Jan	Arajet
06 Dec - 10 Jan	Arajet
05 Dec - 08 Dec	Viva
20 Dec - 22 Dec	Arajet
04 Dec - 07 Dec	Avianca
06 Dec - 11 Jan	Arajet
18 Dec - 22 Dec	Avianca
18 Dec - 25 Dec	Aeromexico	direct
18 Dec - 21 Dec	Copa
20 Dec - 29 Dec	Arajet
14 Dec - 20 Dec	Viva
28 Dec - 04 Jan	Copa
27 Dec - 03 Jan	Copa
20 Dec - 04 Jan	Copa
26 Dec - 04 Jan	Copa
13 Dec - 01 Jan	Copa
18 Dec - 23 Dec	Avianca
27 Dec - 05 Jan	Arajet
12 Dec - 20 Dec	Volaris

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 363€

Return flights