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

Return flights

12 Sep - 19 Sep	Avianca	direct
09 Sep - 16 Sep	Avianca	direct
08 Sep - 14 Sep	Avianca	direct
19 Sep - 25 Sep	Avianca	direct
01 Sep - 08 Sep	Avianca	direct
02 Sep - 14 Sep	Avianca
03 Sep - 10 Sep	Avianca
01 Sep - 05 Sep	Avianca	direct
10 Sep - 19 Sep	Avianca
22 Sep - 29 Sep	Avianca
29 Sep - 12 Oct	Avianca
26 Sep - 03 Oct	Avianca
27 Sep - 06 Oct	Avianca
22 Sep - 22 Oct	Avianca
27 Sep - 05 Oct	Copa
27 Sep - 05 Oct	Aeromexico	direct

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.

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Cheapest return flights from Mexico City to San Jose in September from 199€

Return flights