AirHint found the following cheapest return flights from Seattle (SEA) to Seoul (GMP) in May 2026 (see full year).
Return flights
| 09 May - 20 May | Japan Airlines | ||
| 27 May - 04 Jun | Japan Airlines | ||
| 07 May - 12 May | Japan Airlines | ||
| 21 May - 31 May | ANA |
Also check the deals for one-way flights from Seattle to Seoul in May.
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