Cheapest return flights from St. Louis to Seoul in December from 665€

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

Return flights

04 Dec - 11 Dec Air Canada
24 Dec - 15 Jan United
25 Dec - 15 Jan WestJet
10 Dec - 07 Jan Frontier Airlines
12 Dec - 07 Jan Frontier Airlines
12 Dec - 06 Jan Frontier Airlines
18 Dec - 08 Jan WestJet
20 Dec - 09 Jan Frontier Airlines
19 Dec - 09 Jan Frontier Airlines
18 Dec - 09 Jan WestJet

Also check the deals for one-way flights from St. Louis 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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