AirHint found the following cheapest return flights from Sapporo (CTS) to Seoul (ICN) in May 2026 (see full year).
Return flights
| 27 May - 30 May | Korean Air | direct | |
| 18 May - 21 May | Korean Air | direct | |
| 03 May - 06 May | Korean Air | direct | |
| 02 May - 06 May | Korean Air | direct |
Also check the deals for one-way flights from Sapporo to Seoul in May.
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