AirHint found the following cheapest one-way flights from Seattle (SEA) to Amsterdam (AMS) in December 2025 (see full year).
One-Way flights
| 31 Dec | Icelandair | ||
| 29 Dec | Lufthansa | ||
| 30 Dec | Icelandair | ||
| 29 Dec | Virgin Atlantic | direct | |
| 31 Dec | Virgin Atlantic | direct | |
| 30 Dec | Virgin Atlantic | direct |
Also check the deals for return flights from Seattle to Amsterdam in December.
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