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

Return flights

15 Sep - 22 Sep	Volaris El Salvador	direct
25 Sep - 30 Sep	Avianca	direct
12 Sep - 28 Sep	Volaris El Salvador	direct
09 Sep - 19 Sep	Avianca
09 Sep - 16 Sep	Avianca
10 Sep - 17 Sep	Avianca
09 Sep - 19 Sep	Avianca	direct
08 Sep - 10 Sep	Avianca
05 Sep - 12 Sep	Avianca
10 Sep - 17 Sep	Avianca	direct

Also check the deals for one-way flights from Miami 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 Miami to San Jose in September from $208

Return flights