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 | ||
| 11 Dec - 24 Dec | WestJet | ||
| 23 Dec - 30 Dec | Alaska Airlines |
Also check the deals for one-way flights from Seattle to Charleroi in December.
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