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

Return flights

18 Sep - 10 Oct	WestJet
26 Sep - 10 Oct	WestJet
10 Sep - 11 Oct	WestJet
30 Sep - 24 Oct	WestJet
11 Sep - 12 Oct	WestJet
07 Sep - 14 Sep	WestJet
30 Sep - 12 Oct	WestJet
02 Sep - 14 Sep	WestJet
09 Sep - 19 Oct	Porter Airlines (Canada) Ltd
30 Sep - 14 Oct	WestJet
05 Sep - 14 Sep	WestJet
11 Sep - 18 Sep	Porter Airlines (Canada) Ltd
13 Sep - 20 Sep	WestJet
06 Sep - 20 Sep	Porter Airlines (Canada) Ltd
30 Sep - 16 Oct	WestJet
30 Sep - 07 Oct	WestJet
06 Sep - 21 Sep	WestJet
06 Sep - 13 Sep	WestJet
10 Sep - 17 Sep	WestJet
08 Sep - 15 Sep	WestJet

Also check the deals for one-way flights from Montreal 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 Montreal to Seoul in September from 668€

Return flights