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

Return flights

19 Sep - 24 Sep	Arajet
05 Sep - 08 Sep	Arajet
01 Sep - 08 Sep	Arajet
12 Sep - 21 Sep	Arajet
26 Sep - 03 Oct	Arajet
06 Sep - 13 Sep	Arajet
09 Sep - 12 Sep	Aeromexico
02 Sep - 08 Sep	Avianca
03 Sep - 11 Sep	Avianca
10 Sep - 18 Sep	Avianca
12 Sep - 30 Sep	Arajet

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

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 September from $258

Return flights