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

Return flights

12 Sep - 15 Sep	Arajet
19 Sep - 22 Sep	Arajet
12 Sep - 17 Sep	Arajet
05 Sep - 08 Sep	Arajet
12 Sep - 18 Sep	Arajet
12 Sep - 16 Sep	Arajet
15 Sep - 21 Sep	Arajet
10 Sep - 15 Sep	Copa
18 Sep - 22 Sep	Copa
21 Sep - 30 Sep	Copa
27 Sep - 04 Oct	Copa
28 Sep - 05 Oct	Volaris

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 245€

Return flights