Cheapest return flights from St. Louis to Seoul in December from $1106

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

Return flights

24 Dec - 17 Jan Alaska Airlines
29 Dec - 08 Jan Frontier Airlines
24 Dec - 16 Jan Hawaiian Airlines
24 Dec - 15 Jan Alaska Airlines
09 Dec - 11 Jan Korean Air
10 Dec - 07 Jan Frontier Airlines
10 Dec - 11 Jan Frontier Airlines
01 Dec - 01 Jan Delta
14 Dec - 11 Jan United
13 Dec - 11 Jan United
20 Dec - 27 Dec Delta

Also check the deals for one-way flights from St. Louis to Seoul in December.

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