AirHint found the following cheapest one-way flights from Seoul (ICN) to Seattle (SEA) in April 2026 (see full year).
One-Way flights
| 11 Apr | T'way Air | ||
| 19 Apr | T'way Air | ||
| 12 Apr | T'way Air | ||
| 15 Apr | Hainan Airlines | ||
| 04 Apr | T'way Air | ||
| 02 Apr | China Airlines | ||
| 05 Apr | Air Premia | ||
| 23 Apr | EVA Air | ||
| 22 Apr | EVA Air | ||
| 15 Apr | Korean Air | direct |
Also check the deals for return flights from Seoul to Seattle in April.
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