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

Return flights

04 Sep - 11 Sep	WestJet
06 Sep - 21 Sep	WestJet
12 Sep - 21 Sep	WestJet
04 Sep - 25 Sep	WestJet
11 Sep - 18 Sep	WestJet
09 Sep - 12 Oct	WestJet
07 Sep - 14 Sep	WestJet
16 Sep - 23 Sep	WestJet
09 Sep - 14 Sep	WestJet
09 Sep - 23 Sep	WestJet
08 Sep - 15 Sep	WestJet
30 Sep - 21 Oct	WestJet
27 Sep - 11 Oct	WestJet
26 Sep - 03 Oct	WestJet
30 Sep - 07 Oct	WestJet
12 Sep - 07 Oct	WestJet
18 Sep - 10 Oct	WestJet
24 Sep - 08 Oct	Porter Airlines (Canada) Ltd
10 Sep - 06 Oct	WestJet
24 Sep - 10 Oct	Porter Airlines (Canada) Ltd

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 $797

Return flights