AirHint found the following cheapest one-way flights from Seattle (SEA) to Copenhagen (CPH) in December 2025 (see full year).
One-Way flights
| 05 Dec | WestJet | ||
| 24 Dec | Icelandair | ||
| 25 Dec | Frontier Airlines | ||
| 14 Dec | Icelandair | ||
| 16 Dec | Hawaiian Airlines | ||
| 23 Dec | Frontier Airlines |
Also check the deals for return flights from Seattle to Copenhagen in December.
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