AirHint found the following cheapest return flights from Ontario (ONT) to Seoul (ICN) in January 2026 (see full year).

Return flights

25 Jan - 05 Feb	Frontier Airlines
15 Jan - 22 Jan	Japan Airlines
16 Jan - 23 Jan	Japan Airlines
17 Jan - 25 Jan	Japan Airlines
17 Jan - 24 Jan	Japan Airlines
31 Jan - 22 Feb	Japan Airlines
31 Jan - 04 Feb	Japan Airlines
20 Jan - 03 Feb	Japan Airlines
31 Jan - 27 Feb	China Airlines
18 Jan - 29 Jan	China Airlines
15 Jan - 19 Jan	Korean Air
22 Jan - 26 Jan	Korean Air
13 Jan - 20 Jan	Korean Air
12 Jan - 11 Feb	Korean Air
25 Jan - 25 Feb	Korean Air
22 Jan - 30 Jan	Korean Air
20 Jan - 30 Jan	Korean Air
31 Jan - 12 Feb	Korean Air
20 Jan - 13 Feb	Korean Air
22 Jan - 01 Feb	Korean Air

Also check the deals for one-way flights from Ontario to Seoul in January.

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 January from $810

Return flights