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

Return flights

29 Sep - 09 Oct	WestJet
29 Sep - 19 Oct	WestJet
04 Sep - 25 Sep	WestJet
01 Sep - 25 Sep	WestJet
06 Sep - 18 Sep	WestJet
05 Sep - 15 Sep	WestJet
01 Sep - 14 Sep	WestJet
11 Sep - 25 Sep	WestJet
04 Sep - 18 Sep	WestJet
19 Sep - 21 Sep	WestJet
12 Sep - 18 Sep	WestJet
08 Sep - 21 Sep	WestJet
29 Sep - 17 Oct	WestJet
22 Sep - 10 Oct	WestJet
22 Sep - 12 Oct	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 842€

Return flights