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

Return flights

17 Sep - 22 Sep	Viva
03 Sep - 22 Sep	Viva
03 Sep - 19 Sep	Viva
13 Sep - 22 Sep	Viva
06 Sep - 22 Sep	Viva
29 Sep - 06 Oct	Aeromexico	direct
13 Sep - 19 Sep	Viva
06 Sep - 19 Sep	Viva
17 Sep - 24 Sep	Aeromexico	direct
17 Sep - 22 Sep	Avianca	direct
26 Sep - 01 Oct	Avianca	direct
13 Sep - 19 Sep	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 $191

Return flights