AirHint found the following cheapest return flights from San Jose (SJO) to Brussels (BRU) in December 2025 (see full year).
Return flights
| 15 Dec - 17 Jan | Spirit Airlines | ||
| 22 Dec - 31 Jan | Frontier Airlines | ||
| 21 Dec - 31 Jan | Air France | ||
| 24 Dec - 01 Jan | Iberia | ||
| 21 Dec - 23 Dec | KLM |
Also check the deals for one-way flights from San Jose to Brussels in December.
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