AirHint found the following cheapest return flights from Mexico City (MEX) to San Juan (SJU) in September 2026 (see full year).

Return flights

28 Sep - 05 Oct	Arajet
09 Sep - 16 Sep	Arajet
04 Sep - 07 Sep	Arajet
18 Sep - 26 Sep	Avianca
10 Sep - 17 Sep	Avianca
19 Sep - 26 Sep	Avianca
18 Sep - 27 Sep	Avianca
11 Sep - 20 Sep	Avianca
13 Sep - 20 Sep	Avianca
18 Sep - 21 Sep	Avianca
25 Sep - 29 Sep	Avianca
25 Sep - 30 Oct	Copa

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 $318

Return flights