AirHint found the following cheapest return flights from Denver (DEN) to Brussels (BRU) in December 2025 (see full year).
Return flights
| 23 Dec - 30 Dec | Turkish Airlines | ||
| 14 Dec - 29 Dec | Frontier Airlines | ||
| 20 Dec - 05 Jan | Frontier Airlines | ||
| 25 Dec - 01 Jan | United |
Also check the deals for one-way flights from Denver to Brussels in December.
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