AirHint found the following cheapest return flights from San Jose (SJC) to San Juan (SJU) in December 2025 (see full year).

Return flights

30 Dec - 10 Jan	Frontier Airlines
31 Dec - 10 Jan	Aeromexico
25 Dec - 03 Jan	Frontier Airlines
30 Dec - 13 Jan	Alaska Airlines
28 Dec - 04 Jan	Frontier Airlines
30 Dec - 03 Jan	Aeromexico
31 Dec - 04 Jan	Aeromexico
23 Dec - 26 Dec	Alaska Airlines
29 Dec - 06 Jan	Alaska Airlines
26 Dec - 28 Dec	Alaska Airlines
26 Dec - 29 Dec	Alaska Airlines
25 Dec - 29 Dec	Alaska Airlines
20 Dec - 23 Dec	Alaska Airlines
30 Dec - 02 Jan	Alaska Airlines
20 Dec - 06 Jan	Alaska Airlines
19 Dec - 24 Dec	Alaska Airlines

Also check the deals for one-way flights from San Jose to San Juan 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 San Jose to San Juan in December from $576

Return flights