Cheapest one-way flights from Seattle to Seoul in December from $351

AirHint found the following cheapest one-way flights from Seattle (SEA) to Seoul (GMP) in December 2025 (see full year).

One-Way flights

01 Dec Alaska Airlines
04 Dec Japan Airlines
29 Dec Japan Airlines
10 Dec Japan Airlines
07 Dec Japan Airlines
06 Dec Japan Airlines
27 Dec Hainan Airlines
12 Dec Japan Airlines
13 Dec Japan Airlines
31 Dec ANA

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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