AirHint found the following cheapest return flights from Cardiff (CWL) to Brussels (BRU) in December 2025 (see full year).
Return flights
| 13 Dec - 17 Dec | Ryanair | ||
| 10 Dec - 12 Dec | Ryanair | ||
| 30 Dec - 03 Jan | Ryanair | ||
| 25 Dec - 01 Jan | KLM | ||
| 13 Dec - 16 Dec | KLM |
Also check the deals for one-way flights from Cardiff to Brussels in December.
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