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

Return flights

03 Dec - 10 Dec	China Airlines
08 Dec - 19 Dec	China Airlines
01 Dec - 11 Dec	China Airlines
04 Dec - 16 Dec	China Airlines
05 Dec - 30 Dec	China Airlines
03 Dec - 21 Dec	China Airlines
06 Dec - 13 Dec	China Airlines
30 Dec - 18 Jan	China Airlines
25 Dec - 12 Jan	China Airlines
09 Dec - 14 Dec	China Airlines
10 Dec - 17 Dec	China Airlines
11 Dec - 18 Dec	China Airlines
11 Dec - 19 Jan	China Airlines
23 Dec - 18 Jan	China Airlines
26 Dec - 08 Jan	China Airlines
26 Dec - 09 Jan	China Airlines
11 Dec - 31 Jan	China Airlines
13 Dec - 15 Jan	China Airlines
18 Dec - 09 Jan	Hawaiian Airlines
16 Dec - 11 Jan	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 $1260

Return flights