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

Return flights

03 Dec - 10 Dec	Korean Air
05 Dec - 22 Dec	Hawaiian Airlines
02 Dec - 13 Dec	Korean Air
09 Dec - 23 Dec	Korean Air
04 Dec - 21 Dec	Korean Air
30 Dec - 12 Jan	Korean Air
29 Dec - 21 Jan	Korean Air
29 Dec - 15 Jan	Korean Air
31 Dec - 18 Jan	Korean Air
15 Dec - 23 Jan	Korean Air
08 Dec - 12 Jan	Korean Air
27 Dec - 12 Jan	Korean Air
09 Dec - 27 Dec	Korean Air
14 Dec - 13 Jan	Korean Air
16 Dec - 21 Dec	Korean Air
22 Dec - 15 Jan	Korean Air
15 Dec - 23 Dec	Korean Air
29 Dec - 10 Jan	Korean Air
06 Dec - 28 Dec	Hawaiian Airlines
16 Dec - 29 Dec	Korean Air

Also check the deals for one-way flights from San Jose 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 San Jose to Seoul in December from $833

Return flights