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

Return flights

09 Apr - 16 Apr	China Airlines
10 Apr - 17 Apr	China Airlines
09 Apr - 27 Apr	China Airlines
12 Apr - 25 Apr	China Airlines
30 Apr - 28 May	China Airlines
08 Apr - 15 Apr	China Airlines
06 Apr - 18 Apr	China Airlines
20 Apr - 31 May	China Airlines
30 Apr - 12 May	China Airlines
01 Apr - 13 Apr	China Airlines
01 Apr - 29 Apr	China Airlines
03 Apr - 12 Apr	China Airlines
19 Apr - 01 May	China Airlines

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

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 April from 917€

Return flights