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

Return flights

28 Aug - 04 Sep	China Airlines
30 Aug - 01 Sep	China Airlines
31 Aug - 04 Sep	China Airlines
29 Aug - 02 Sep	China Airlines
28 Aug - 02 Sep	China Airlines
27 Aug - 03 Sep	China Airlines
26 Aug - 17 Sep	China Airlines
26 Aug - 16 Sep	China Airlines
23 Aug - 20 Sep	China Airlines
26 Aug - 03 Sep	China Airlines
19 Aug - 26 Aug	Korean Air
29 Aug - 31 Aug	China Airlines
27 Aug - 30 Aug	China Airlines
24 Aug - 30 Aug	China Airlines
26 Aug - 28 Aug	China Airlines
18 Aug - 20 Aug	China Airlines
17 Aug - 20 Aug	China Airlines
17 Aug - 21 Aug	China Airlines
19 Aug - 29 Aug	China Airlines
17 Aug - 29 Aug	China Airlines

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

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 August from 915€

Return flights