AirHint found the following cheapest return flights from Oakland (OAK) to Brussels (BRU) in December 2025 (see full year).
Return flights
| 04 Dec - 14 Dec | Delta | ||
| 02 Dec - 27 Dec | Hawaiian Airlines | ||
| 19 Dec - 26 Dec | Alaska Airlines | ||
| 25 Dec - 01 Jan | Icelandair | ||
| 07 Dec - 14 Dec | Alaska Airlines | ||
| 18 Dec - 30 Dec | Icelandair |
Also check the deals for one-way flights from Oakland to Brussels in December.
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