AirHint found the following cheapest return flights from St. Louis (STL) to Seoul (ICN) in January 2026 (see full year).

Return flights

23 Jan - 09 Feb	Alaska Airlines
16 Jan - 31 Jan	Delta
16 Jan - 01 Feb	Delta
11 Jan - 17 Jan	Delta
10 Jan - 13 Jan	Korean Air

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

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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Cheapest return flights from St. Louis to Seoul in January from $779

Return flights