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

Return flights

08 Dec - 15 Dec	China Airlines
01 Dec - 07 Dec	China Airlines
05 Dec - 23 Dec	China Airlines
01 Dec - 27 Dec	China Airlines
08 Dec - 22 Dec	China Airlines
30 Dec - 13 Jan	China Airlines
27 Dec - 30 Dec	China Airlines
25 Dec - 13 Jan	China Airlines
22 Dec - 16 Jan	China Airlines
22 Dec - 19 Jan	China Airlines
15 Dec - 22 Dec	China Airlines
24 Dec - 16 Jan	China Airlines
22 Dec - 20 Jan	China Airlines
10 Dec - 12 Jan	China Airlines
23 Dec - 16 Jan	China Airlines
22 Dec - 13 Jan	China Airlines
23 Dec - 13 Jan	China Airlines
14 Dec - 28 Dec	China Airlines
22 Dec - 31 Dec	China Airlines
20 Dec - 24 Dec	China Airlines

Also check the deals for one-way flights from Ontario 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 Ontario to Seoul in December from 1021€

Return flights