Cheapest one-way flights from Seattle to Seoul in December from 378€

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

One-Way flights

10 Dec Asiana Airlines direct
08 Dec Asiana Airlines direct
04 Dec Air Canada
07 Dec Asiana Airlines direct
04 Dec Delta direct
06 Dec Delta direct
27 Dec Delta direct
23 Dec Delta
13 Dec Hawaiian Airlines
15 Dec WestJet

Also check the deals for return flights from Seattle to Seoul in December.

Skyscanner

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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Feel free to contact us with any feedback or request another flight research.