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

Return flights

06 Sep - 13 Sep	WestJet
19 Sep - 19 Oct	WestJet
20 Sep - 19 Oct	WestJet
19 Sep - 11 Oct	WestJet
04 Sep - 28 Sep	WestJet
12 Sep - 18 Sep	WestJet
07 Sep - 14 Sep	WestJet
29 Sep - 23 Oct	WestJet
17 Sep - 16 Oct	WestJet
25 Sep - 20 Oct	WestJet
23 Sep - 20 Oct	WestJet
10 Sep - 21 Sep	WestJet
15 Sep - 22 Sep	WestJet
04 Sep - 20 Sep	WestJet
13 Sep - 21 Sep	WestJet
12 Sep - 21 Sep	WestJet
29 Sep - 11 Oct	WestJet
29 Sep - 19 Oct	WestJet
28 Sep - 18 Oct	WestJet
14 Sep - 18 Sep	WestJet

Also check the deals for one-way flights from Waterloo 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 Waterloo to Seoul in September from $816

Return flights