AirHint found the following cheapest one-way flights from Seattle (SEA) to Seoul (GMP) in December 2025 (see full year).
One-Way flights
| 31 Dec | Japan Airlines | ||
| 24 Dec | Japan Airlines | ||
| 29 Dec | ANA | ||
| 26 Dec | China Airlines | ||
| 23 Dec | Philippine Airlines |
Also check the deals for return flights from Seattle to Seoul in December.
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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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