AirHint found the following cheapest return flights from Seattle (SEA) to Seoul (ICN) in September 2026 (see full year).
Return flights
| 02 Sep - 17 Sep | Delta | direct | |
| 01 Sep - 17 Sep | Delta | direct | |
| 17 Sep - 10 Oct | Korean Air | direct | |
| 18 Sep - 10 Oct | Korean Air | direct | |
| 23 Sep - 09 Oct | Asiana Airlines | direct |
Also check the deals for one-way flights from Seattle to Seoul in September.
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