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

Return flights

22 Sep - 27 Sep	Avianca
05 Sep - 09 Sep	Avianca
24 Sep - 29 Sep	Avianca
13 Sep - 22 Sep	Avianca
09 Sep - 15 Sep	Avianca
13 Sep - 17 Sep	Avianca	direct
11 Sep - 17 Sep	Avianca	direct
12 Sep - 28 Sep	Avianca	direct
12 Sep - 16 Sep	Avianca	direct
23 Sep - 30 Sep	Avianca
26 Sep - 03 Oct	Aeromexico	direct
26 Sep - 04 Oct	Copa
29 Sep - 03 Oct	Avianca

Also check the deals for one-way flights from Mexico City to San Jose 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.

Book a cheap hotel in San Jose

Cheap car rent in San Jose

Cheapest return flights from Mexico City to San Jose in September from $245

Return flights