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

Return flights

06 Dec - 13 Dec	Korean Air
12 Dec - 22 Dec	Hawaiian Airlines
18 Dec - 25 Dec	Korean Air
28 Dec - 13 Jan	Korean Air
12 Dec - 31 Dec	Hawaiian Airlines
18 Dec - 10 Jan	Korean Air
13 Dec - 08 Jan	Korean Air
20 Dec - 10 Jan	Alaska Airlines
19 Dec - 05 Jan	Hawaiian Airlines
19 Dec - 04 Jan	Hawaiian Airlines
07 Dec - 27 Dec	Korean Air
05 Dec - 21 Dec	Korean Air
03 Dec - 17 Dec	Korean Air
02 Dec - 13 Dec	Korean Air
03 Dec - 28 Jan	Korean Air
24 Dec - 31 Dec	Korean Air
26 Dec - 09 Jan	Korean Air
24 Dec - 01 Jan	Korean Air
12 Dec - 27 Dec	Korean Air
18 Dec - 01 Jan	Korean Air

Also check the deals for one-way flights from Oakland 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 Oakland to Seoul in December from $1028

Return flights