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

Return flights

01 Dec - 07 Dec	Air Canada
05 Dec - 07 Dec	United
29 Dec - 17 Jan	Delta
10 Dec - 17 Dec	United
24 Dec - 15 Jan	United
12 Dec - 21 Dec	Hawaiian Airlines
13 Dec - 22 Dec	Hawaiian Airlines
24 Dec - 31 Dec	Frontier Airlines
14 Dec - 27 Dec	Hawaiian Airlines
25 Dec - 01 Jan	United
15 Dec - 29 Dec	Korean Air
14 Dec - 07 Jan	Hawaiian Airlines
22 Dec - 06 Jan	United
23 Dec - 06 Jan	Delta
20 Dec - 06 Jan	Delta
22 Dec - 05 Jan	United
19 Dec - 30 Dec	Delta
19 Dec - 06 Jan	Delta

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 $803

Return flights