Cheapest return flights from Ontario to Seoul in September from $929

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

Return flights

05 Sep - 10 Sep Frontier Airlines
21 Sep - 10 Oct China Airlines
29 Sep - 30 Oct China Airlines
27 Sep - 09 Oct China Airlines
21 Sep - 12 Oct China Airlines
09 Sep - 13 Sep China Airlines
10 Sep - 17 Sep China Airlines
08 Sep - 11 Sep China Airlines
29 Sep - 09 Oct China Airlines
16 Sep - 07 Oct China Airlines
23 Sep - 08 Oct China Airlines
09 Sep - 12 Sep China Airlines
22 Sep - 31 Oct China Airlines
16 Sep - 08 Oct China Airlines
27 Sep - 10 Oct China Airlines
14 Sep - 30 Sep Alaska Airlines
06 Sep - 10 Sep China Airlines
09 Sep - 20 Sep China Airlines
16 Sep - 23 Sep China Airlines
17 Sep - 20 Sep China Airlines

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

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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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