AirHint found the following cheapest return flights from St. Louis (STL) to Seoul (ICN) in May 2026 (see full year).
Return flights
| 05 May - 19 May | Delta | ||
| 27 May - 11 Jun | Air Canada | ||
| 26 May - 11 Jun | Air Canada | ||
| 28 May - 16 Jun | Air Canada | ||
| 21 May - 03 Jun | Air Canada | ||
| 16 May - 23 May | Air Canada | ||
| 23 May - 31 May | Air Canada |
Also check the deals for one-way flights from St. Louis to Seoul in May.
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