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

Return flights

12 Sep - 19 Sep	Aeromexico
28 Sep - 05 Oct	Aeromexico
27 Sep - 05 Oct	Aeromexico
28 Sep - 06 Oct	Aeromexico
06 Sep - 14 Sep	Aeromexico
10 Sep - 17 Sep	Aeromexico
13 Sep - 16 Sep	Aeromexico
14 Sep - 17 Sep	Aeromexico
17 Sep - 21 Sep	Copa
23 Sep - 27 Sep	Aeromexico
21 Sep - 29 Sep	Aeromexico
12 Sep - 16 Sep	Aeromexico
10 Sep - 14 Sep	Aeromexico
29 Sep - 05 Oct	Aeromexico

Also check the deals for one-way flights from Guadalajara 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 Guadalajara to San Jose in September from 247€

Return flights