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

Return flights

10 Sep - 17 Sep	Avianca	direct
16 Sep - 20 Sep	Avianca
20 Sep - 25 Sep	Avianca	direct
23 Sep - 30 Sep	Avianca
06 Sep - 15 Sep	Avianca	direct
02 Sep - 14 Sep	Avianca
18 Sep - 23 Sep	Avianca
11 Sep - 14 Sep	Avianca	direct
11 Sep - 15 Sep	Avianca	direct
16 Sep - 23 Sep	Avianca
29 Sep - 12 Oct	Avianca
27 Sep - 05 Oct	Avianca	direct
27 Sep - 07 Oct	Avianca	direct
26 Sep - 03 Oct	Avianca
29 Sep - 06 Oct	Avianca
08 Sep - 03 Oct	Avianca
08 Sep - 03 Oct	Aeromexico	direct
26 Sep - 05 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.

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Cheapest return flights from Mexico City to San Jose in September from 208€

Return flights