AirHint found the following cheapest return flights from Boise (BOI) to Denver (DEN) in December 2025 (see full year).
Return flights
| 30 Dec - 03 Jan | Alaska Airlines | ||
| 30 Dec - 03 Jan | United | direct | |
| 11 Dec - 14 Dec | United | direct | |
| 23 Dec - 27 Dec | Southwest Airlines |
Also check the deals for one-way flights from Boise to Denver in December.
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