Cheapest return flights from Seattle to Seoul in December from $782

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

Return flights

08 Dec - 12 Dec Air Canada
10 Dec - 17 Dec Alaska Airlines
01 Dec - 06 Dec Air Canada
08 Dec - 16 Dec Air Canada
08 Dec - 16 Dec Asiana Airlines direct
10 Dec - 23 Dec Asiana Airlines direct
23 Dec - 15 Jan Asiana Airlines direct
08 Dec - 12 Dec Korean Air direct
01 Dec - 06 Dec Delta direct
27 Dec - 29 Dec Air Canada
30 Dec - 08 Jan Air Canada
10 Dec - 17 Dec Korean Air direct
27 Dec - 08 Jan Air Canada
22 Dec - 11 Jan Korean Air
22 Dec - 15 Jan Korean Air
25 Dec - 09 Jan Air Canada
25 Dec - 08 Jan Air Canada
30 Dec - 08 Jan Korean Air direct
23 Dec - 12 Jan Asiana Airlines
27 Dec - 08 Jan Korean Air direct

Also check the deals for one-way 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.