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

Return flights

02 Dec - 19 Dec	Air Canada
29 Dec - 14 Jan	Delta
29 Dec - 17 Jan	Delta
27 Dec - 14 Jan	Delta
26 Dec - 14 Jan	Hawaiian Airlines
26 Dec - 13 Jan	Frontier Airlines
28 Dec - 14 Jan	Frontier Airlines
28 Dec - 13 Jan	Frontier Airlines
10 Dec - 28 Dec	United
10 Dec - 29 Dec	Air Canada
29 Dec - 13 Jan	Hawaiian Airlines
13 Dec - 15 Dec	Hawaiian Airlines
24 Dec - 15 Jan	United
12 Dec - 22 Dec	Frontier Airlines
12 Dec - 21 Dec	Frontier Airlines
13 Dec - 22 Dec	Hawaiian Airlines
10 Dec - 09 Jan	United
14 Dec - 27 Dec	United
19 Dec - 26 Dec	Hawaiian Airlines
13 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 769€

Return flights