AirHint found the following cheapest return flights from Boise (BOI) to San Jose (SJO) in December 2025 (see full year).
Return flights
| 09 Dec - 17 Dec | United | ||
| 06 Dec - 12 Jan | United | ||
| 18 Dec - 27 Dec | Frontier Airlines |
Also check the deals for one-way flights from Boise to San Jose in December.
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