AirHint found the following cheapest one-way flights from Denver (DEN) to San Jose (SJO) in December 2025 (see full year).
One-Way flights
| 06 Dec | Frontier Airlines | ||
| 01 Dec | Frontier Airlines | ||
| 30 Dec | Frontier Airlines | ||
| 06 Dec | United | direct | |
| 12 Dec | Frontier Airlines | ||
| 12 Dec | United | direct | |
| 07 Dec | Delta | ||
| 30 Dec | United | direct | |
| 09 Dec | Copa | ||
| 10 Dec | Copa |
Also check the deals for return flights from Denver to San Jose in December.
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