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

Return flights

26 Sep - 03 Oct	Aeromexico	direct
17 Sep - 23 Sep	Avianca	direct
23 Sep - 01 Oct	Avianca
24 Sep - 01 Oct	Avianca
23 Sep - 03 Oct	Avianca
24 Sep - 02 Oct	Avianca
25 Sep - 02 Oct	Avianca
24 Sep - 01 Oct	Aeromexico	direct
25 Sep - 02 Oct	Aeromexico	direct
24 Sep - 02 Oct	Aeromexico	direct
24 Sep - 30 Sep	Avianca
09 Sep - 16 Sep	Avianca
18 Sep - 22 Sep	Avianca	direct
20 Sep - 01 Oct	Avianca
16 Sep - 19 Sep	Avianca
20 Sep - 28 Sep	Avianca
25 Sep - 29 Sep	Avianca
16 Sep - 22 Sep	Avianca
22 Sep - 29 Sep	Aeromexico	direct
19 Sep - 22 Sep	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.

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Cheapest return flights from Mexico City to San Jose in September from $244

Return flights