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

Return flights

01 May - 31 May	China Airlines
13 May - 26 May	China Airlines
06 May - 13 May	China Airlines
01 May - 15 May	China Airlines
17 May - 31 May	China Airlines
21 May - 11 Jun	China Airlines
17 May - 11 Jun	China Airlines
21 May - 30 May	China Airlines
21 May - 21 Jun	China Airlines
23 May - 28 May	China Airlines
26 May - 24 Jun	China Airlines
31 May - 20 Jun	China Airlines
29 May - 12 Jun	China Airlines
25 May - 08 Jun	Korean Air

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

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 May from $911

Return flights