AirHint found the following cheapest one-way flights from Seoul (ICN) to Seattle (SEA) in December 2025 (see full year).
One-Way flights
| 02 Dec | T'way Air | ||
| 04 Dec | T'way Air | ||
| 16 Dec | T'way Air | ||
| 24 Dec | Hainan Airlines | ||
| 03 Dec | Hainan Airlines | ||
| 25 Dec | T'way Air | ||
| 14 Dec | Air Canada | ||
| 27 Dec | Air Canada | ||
| 20 Dec | Air Canada | ||
| 25 Dec | Asiana Airlines | direct |
Also check the deals for return flights from Seoul to Seattle in December.
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