AirHint found the following cheapest return flights from Toronto (YYZ) to Seoul (ICN) in October 2025 (see full year).

Return flights

01 Oct - 16 Oct	WestJet
02 Oct - 17 Oct	WestJet
02 Oct - 16 Oct	WestJet
02 Oct - 11 Oct	WestJet
19 Oct - 26 Oct	WestJet
04 Oct - 25 Oct	WestJet
18 Oct - 26 Oct	WestJet
01 Oct - 19 Oct	WestJet
22 Oct - 28 Oct	WestJet
02 Oct - 12 Oct	WestJet
19 Oct - 16 Nov	Porter Airlines (Canada) Ltd
26 Oct - 02 Nov	WestJet
04 Oct - 02 Nov	WestJet
24 Oct - 09 Nov	WestJet
18 Oct - 01 Nov	WestJet
02 Oct - 02 Nov	WestJet
25 Oct - 02 Nov	WestJet
25 Oct - 01 Nov	WestJet
23 Oct - 23 Nov	WestJet
18 Oct - 02 Nov	WestJet

Also check the deals for one-way flights from Toronto to Seoul in October.

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 Toronto to Seoul in October from $635

Return flights