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

Return flights

26 Sep - 05 Oct	Avianca
29 Sep - 30 Sep	Avianca
24 Sep - 01 Oct	LATAM Airlines Group
30 Sep - 13 Oct	LATAM Airlines Group
22 Sep - 26 Sep	Avianca
18 Sep - 25 Sep	Avianca
25 Sep - 28 Sep	Avianca
30 Sep - 05 Oct	Copa
21 Sep - 28 Sep	Avianca
18 Sep - 28 Sep	Copa
30 Sep - 04 Oct	Copa
18 Sep - 21 Sep	Avianca

Also check the deals for one-way flights from Santiago 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 Santiago to San Jose in September from 319€

Return flights