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

Return flights

24 Sep - 14 Oct	Volaris	direct
24 Sep - 14 Oct	Avianca
23 Sep - 30 Sep	Avianca
26 Sep - 10 Oct	Avianca
19 Sep - 23 Sep	Avianca
23 Sep - 26 Sep	Copa
20 Sep - 22 Sep	Avianca
22 Sep - 29 Sep	Avianca
23 Sep - 29 Sep	Copa
19 Sep - 23 Sep	Volaris	direct
25 Sep - 28 Sep	Volaris Costa Rica	direct
30 Sep - 30 Oct	Avianca
21 Sep - 26 Sep	Avianca
21 Sep - 24 Sep	Avianca
26 Sep - 10 Oct	Volaris	direct
29 Sep - 08 Oct	Copa
29 Sep - 14 Oct	Copa

Also check the deals for one-way flights from Cancun 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 Cancun to San Jose in September from 194€

Return flights