AirHint found the following cheapest return flights from Seattle (SEA) to Seoul (ICN) in May 2026 (see full year).
Return flights
| 07 May - 28 May | Delta | direct | |
| 18 May - 05 Jun | Alaska Airlines | direct | |
| 22 May - 26 May | Korean Air | ||
| 22 May - 26 May | Korean Air | direct | |
| 25 May - 06 Jun | Delta | direct |
Also check the deals for one-way flights from Seattle to Seoul in May.
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