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

Return flights

14 Aug - 18 Sep	WestJet
28 Aug - 01 Sep	WestJet
06 Aug - 02 Sep	WestJet
07 Aug - 02 Sep	WestJet
25 Aug - 15 Sep	WestJet
29 Aug - 01 Sep	WestJet
05 Aug - 01 Sep	WestJet
14 Aug - 04 Sep	WestJet
21 Aug - 13 Sep	WestJet
25 Aug - 07 Sep	WestJet
22 Aug - 24 Aug	WestJet
15 Aug - 24 Aug	WestJet
06 Aug - 20 Aug	WestJet
04 Aug - 26 Aug	WestJet
12 Aug - 29 Aug	WestJet
14 Aug - 29 Aug	WestJet
17 Aug - 31 Aug	WestJet
13 Aug - 29 Aug	WestJet
22 Aug - 29 Aug	WestJet
18 Aug - 26 Aug	WestJet

Also check the deals for one-way flights from Toronto 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 Toronto to Seoul in August from 786€

Return flights