AirHint found the following cheapest return flights from Seattle (SEA) to Seoul (ICN) in September 2026 (see full year).
Return flights
| 12 Sep - 18 Sep | Korean Air | ||
| 12 Sep - 22 Sep | Asiana Airlines | direct | |
| 04 Sep - 08 Sep | Asiana Airlines | direct | |
| 13 Sep - 27 Sep | Alaska Airlines |
Also check the deals for one-way flights from Seattle to Seoul in September.
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