AirHint found the following cheapest return flights from Portland (PDX) to Brussels (BRU) in December 2025 (see full year).
Return flights
| 22 Dec - 17 Jan | Air Canada | ||
| 30 Dec - 06 Jan | Hawaiian Airlines | ||
| 17 Dec - 26 Dec | Delta | ||
| 17 Dec - 28 Dec | KLM | ||
| 17 Dec - 27 Dec | United |
Also check the deals for one-way flights from Portland to Brussels in December.
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