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 | ||
| 07 Dec - 14 Dec | Alaska Airlines | ||
| 22 Dec - 30 Dec | Hawaiian Airlines | ||
| 21 Dec - 03 Jan | Korean Air |
Also check the deals for one-way flights from Oakland to Seoul in December.
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