AirHint found the following cheapest return flights from Austin (AUS) to San Jose (SJO) in December 2025 (see full year).

Return flights

01 Dec - 07 Dec	Viva
05 Dec - 07 Dec	Viva
04 Dec - 07 Dec	Spirit Airlines
01 Dec - 17 Dec	Viva
05 Dec - 17 Dec	Viva
04 Dec - 17 Dec	Spirit Airlines
31 Dec - 05 Jan	Aeromexico
31 Dec - 02 Jan	Spirit Airlines
31 Dec - 03 Jan	Spirit Airlines
26 Dec - 02 Jan	Viva
26 Dec - 03 Jan	Viva
26 Dec - 05 Jan	Viva
19 Dec - 02 Jan	Viva
19 Dec - 03 Jan	Viva
19 Dec - 05 Jan	Viva
21 Dec - 02 Jan	Spirit Airlines

Also check the deals for one-way flights from Austin to San Jose in December.

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 Austin to San Jose in December from 243€

Return flights