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

Return flights

03 Dec - 10 Dec	Korean Air
05 Dec - 10 Dec	Korean Air
06 Dec - 16 Dec	Korean Air
02 Dec - 13 Dec	Korean Air
11 Dec - 11 Jan	Korean Air
15 Dec - 23 Jan	Korean Air
08 Dec - 12 Jan	Korean Air
09 Dec - 27 Dec	Alaska Airlines
13 Dec - 10 Jan	Korean Air
31 Dec - 12 Jan	Korean Air
05 Dec - 14 Dec	Korean Air
30 Dec - 12 Jan	Korean Air
10 Dec - 20 Dec	Hawaiian Airlines
24 Dec - 23 Jan	Korean Air
03 Dec - 31 Dec	Korean Air
26 Dec - 08 Jan	Alaska Airlines
17 Dec - 13 Jan	Korean Air
03 Dec - 01 Jan	Korean Air
15 Dec - 31 Dec	Korean Air
13 Dec - 20 Dec	Hawaiian Airlines

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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Oakland to Seoul in December from $833

Return flights