AirHint found the following cheapest return flights from Seattle (SEA) to Charleroi (CRL) in December 2025 (see full year).
Return flights
| 15 Dec - 10 Jan | Hawaiian Airlines | ||
| 18 Dec - 10 Jan | Icelandair | ||
| 24 Dec - 31 Dec | Icelandair | ||
| 25 Dec - 01 Jan | Icelandair | ||
| 20 Dec - 03 Jan | Hawaiian Airlines |
Also check the deals for one-way flights from Seattle to Charleroi in December.
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