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

Return flights

15 Dec - 22 Dec	United
14 Dec - 21 Dec	United
14 Dec - 27 Dec	United
13 Dec - 22 Dec	Alaska Airlines
12 Dec - 21 Dec	Alaska Airlines
13 Dec - 24 Dec	United
12 Dec - 22 Dec	United
14 Dec - 07 Jan	Korean Air
18 Dec - 06 Jan	Finnair
14 Dec - 03 Jan	Korean Air
18 Dec - 31 Dec	United

Also check the deals for one-way flights from San Diego 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 Diego to Seoul in December from $1189

Return flights