Cheapest return flights from Seattle (SEA) to Seoul (ICN), December

20 dates in December, from $ 1,014. Book in one tap, or check whether to buy now or wait.

One-wayReturn
Dates, airline, and price
Dates Airline Price
6 Dec 14 Dec Frontier Airlines
6 Dec 12 Dec Frontier Airlines
5 Dec 12 Dec Alaska Airlines
3 Dec 14 Dec Alaska Airlines
5 Dec 18 Dec Frontier Airlines
10 Dec 28 Dec Korean Air
5 Dec 18 Dec Korean Air
Direct Flight
5 Dec 12 Dec Korean Air
Direct Flight
6 Dec 12 Dec Korean Air
Direct Flight
6 Dec 14 Dec Alaska Airlines
Direct Flight
24 Dec 7 Jan 2027 Korean Air
25 Dec 15 Jan 2027 Delta
Direct Flight
24 Dec 7 Jan 2027 Korean Air
Direct Flight
23 Dec 15 Jan 2027 Cathay Pacific
23 Dec 10 Jan 2027 Frontier Airlines
20 Dec 16 Jan 2027 Alaska Airlines
21 Dec 7 Jan 2027 Frontier Airlines
19 Dec 15 Jan 2027 Cathay Pacific
22 Dec 7 Jan 2027 Alaska Airlines
16 Dec 18 Jan 2027 Korean Air
Powered by

Cheapest deals for the full year

Deals for one-way flights from Seattle to Seoul in December.

Book a cheap hotel in Seoul

Cheap car rent in Incheon Intl

Updated Oct 11, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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