AirHint found the following cheapest return flights from Portland (PDX) to Seoul (ICN) in December 2025 (see full year).

Return flights

03 Dec - 10 Dec	Hawaiian Airlines
03 Dec - 13 Dec	Hawaiian Airlines
11 Dec - 17 Dec	Alaska Airlines
24 Dec - 29 Dec	Hawaiian Airlines
15 Dec - 17 Jan	Hawaiian Airlines
24 Dec - 30 Dec	United
23 Dec - 29 Dec	Hawaiian Airlines
16 Dec - 24 Jan	Alaska Airlines
12 Dec - 19 Dec	Air Canada
12 Dec - 28 Dec	Air Canada
25 Dec - 31 Dec	United
24 Dec - 31 Dec	United
16 Dec - 17 Jan	Hawaiian Airlines
16 Dec - 20 Jan	Hawaiian Airlines
17 Dec - 17 Jan	Hawaiian Airlines
18 Dec - 17 Jan	Hawaiian Airlines
19 Dec - 17 Jan	Korean Air

Also check the deals for one-way flights from Portland to Seoul in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Portland to Seoul in December from $774

Return flights