AirHint found the following cheapest return flights from Portland (PDX) to Seoul (ICN) in September 2026 (see full year).
Return flights
| 22 Sep - 30 Sep | Alaska Airlines | ||
| 01 Sep - 07 Sep | Alaska Airlines | ||
| 17 Sep - 01 Oct | Alaska Airlines |
Also check the deals for one-way flights from Portland to Seoul in September.
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