Cheapest one-way flights from Seattle to Seoul in December from $436

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

One-Way flights

31 Dec Asiana Airlines direct
27 Dec Korean Air direct
29 Dec Asiana Airlines direct
26 Dec United
25 Dec United
26 Dec Hawaiian Airlines direct
24 Dec Korean Air direct
15 Dec Korean Air
22 Dec Alaska Airlines
23 Dec Korean Air direct

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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