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

Return flights

03 Sep - 09 Sep	Volaris Costa Rica	direct
01 Sep - 15 Sep	Avianca	direct
01 Sep - 08 Sep	Avianca	direct
08 Sep - 11 Sep	Avianca	direct
12 Sep - 14 Sep	Avianca	direct
08 Sep - 15 Sep	Avianca	direct
12 Sep - 12 Sep	Avianca	direct
12 Sep - 13 Sep	Avianca	direct
12 Sep - 15 Sep	Avianca	direct
19 Sep - 22 Sep	Avianca	direct

Also check the deals for one-way flights from Guatemala 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 Guatemala City to San Jose in September from 171€

Return flights