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

Return flights

01 Dec - 05 Dec	Air Premia	direct
10 Dec - 17 Dec	Air Premia	direct
05 Dec - 21 Dec	Air Premia	direct
07 Dec - 21 Dec	Air Premia	direct
01 Dec - 15 Dec	Air Premia	direct
05 Dec - 13 Dec	United	direct
29 Dec - 14 Jan	Air Premia	direct
10 Dec - 25 Dec	Asiana Airlines	direct
28 Dec - 20 Jan	United	direct
12 Dec - 15 Dec	Delta
12 Dec - 21 Dec	Delta
24 Dec - 20 Jan	Delta
22 Dec - 25 Dec	Delta
22 Dec - 20 Jan	Delta
27 Dec - 15 Jan	United	direct
15 Dec - 14 Jan	Air Premia	direct
28 Dec - 08 Jan	United	direct
28 Dec - 09 Jan	Air Canada
27 Dec - 09 Jan	Air Canada
27 Dec - 08 Jan	Air Canada

Also check the deals for one-way flights from San Francisco 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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from San Francisco to Seoul in December from 560€

Return flights