AirHint found the following cheapest one-way flights from Seattle (SEA) to Amsterdam (AMS) in December 2025 (see full year).
One-Way flights
| 06 Dec | TAP | ||
| 09 Dec | Lufthansa | ||
| 30 Dec | Hawaiian Airlines | ||
| 07 Dec | Icelandair | ||
| 08 Dec | Icelandair | ||
| 15 Dec | Hawaiian Airlines | ||
| 11 Dec | Frontier Airlines | ||
| 12 Dec | Aer Lingus | ||
| 27 Dec | Turkish Airlines | ||
| 26 Dec | Air Canada |
Also check the deals for return flights from Seattle to Amsterdam in December.
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