AirHint found the following cheapest return flights from St. Louis (STL) to Seoul (ICN) in October 2025 (see full year).
Return flights
| 27 Oct - 13 Nov | Delta | ||
| 22 Oct - 19 Nov | Delta | ||
| 25 Oct - 01 Nov | Delta | ||
| 30 Oct - 10 Nov | United |
Also check the deals for one-way flights from St. Louis to Seoul in October.
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