AirHint found the following cheapest return flights from Portland (PDX) to Seoul (ICN) in May 2026 (see full year).
Return flights
| 05 May - 14 May | Air Canada | ||
| 05 May - 12 May | Air Canada | ||
| 01 May - 10 May | Air Canada | ||
| 01 May - 09 May | Air Canada | ||
| 13 May - 31 May | Alaska Airlines | ||
| 13 May - 27 May | Alaska Airlines |
Also check the deals for one-way flights from Portland to Seoul in May.
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