AirHint found the following cheapest return flights from Denver (DEN) to San Jose (SJO) in January 2026 (see full year).
Return flights
| 22 Jan - 26 Jan | United | ||
| 29 Jan - 02 Feb | United | ||
| 12 Jan - 19 Jan | Frontier Airlines | ||
| 30 Jan - 08 Feb | United | ||
| 24 Jan - 31 Jan | Southwest Airlines | ||
| 03 Jan - 10 Jan | Frontier Airlines |
Also check the deals for one-way flights from Denver to San Jose in January.
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