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

Return flights

14 Sep - 19 Oct	WestJet
19 Sep - 24 Oct	WestJet
25 Sep - 09 Oct	WestJet
20 Sep - 19 Oct	WestJet
20 Sep - 25 Oct	WestJet
20 Sep - 17 Oct	WestJet
12 Sep - 17 Oct	WestJet
19 Sep - 17 Oct	WestJet
05 Sep - 21 Sep	WestJet
10 Sep - 20 Sep	WestJet
16 Sep - 23 Oct	WestJet
07 Sep - 14 Sep	WestJet
03 Sep - 17 Sep	WestJet
10 Sep - 17 Sep	WestJet
04 Sep - 28 Sep	WestJet
12 Sep - 18 Sep	WestJet
04 Sep - 15 Sep	WestJet
03 Sep - 15 Sep	WestJet
02 Sep - 10 Sep	WestJet
26 Sep - 19 Oct	WestJet

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

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 September from 655€

Return flights