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

Return flights

08 Aug - 16 Aug	Arajet
09 Aug - 16 Aug	Arajet
09 Aug - 11 Aug	Arajet
16 Aug - 23 Aug	Arajet
01 Aug - 06 Aug	Arajet
02 Aug - 11 Aug	Arajet
15 Aug - 20 Aug	Arajet
23 Aug - 27 Aug	Arajet
27 Aug - 01 Sep	Avianca
15 Aug - 22 Aug	Arajet
07 Aug - 11 Aug	Avianca
28 Aug - 03 Sep	Avianca
28 Aug - 04 Sep	Copa
27 Aug - 03 Sep	Copa

Also check the deals for one-way flights from Mexico City to San Juan in August.

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 August from $277

Return flights