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

Return flights

18 Mar - 23 Mar	China Airlines
16 Mar - 31 Mar	China Airlines
04 Mar - 18 Mar	China Airlines
10 Mar - 31 Mar	China Airlines
20 Mar - 16 Apr	China Airlines
13 Mar - 29 Mar	China Airlines
01 Mar - 13 Mar	China Airlines
16 Mar - 07 Apr	China Airlines
06 Mar - 14 Mar	China Airlines
29 Mar - 09 Apr	China Airlines
20 Mar - 05 Apr	China Airlines
14 Mar - 05 Apr	China Airlines
20 Mar - 06 Apr	China Airlines
29 Mar - 10 Apr	China Airlines
29 Mar - 05 Apr	China Airlines
28 Mar - 04 Apr	China Airlines
03 Mar - 10 Apr	Qatar Airways

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

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 March from $1034

Return flights