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

Return flights

30 Sep - 23 Oct	WestJet
20 Sep - 11 Oct	Air Transat
30 Sep - 07 Oct	WestJet
27 Sep - 12 Oct	Air Transat
26 Sep - 12 Oct	WestJet
28 Sep - 07 Oct	WestJet
18 Sep - 15 Oct	WestJet
29 Sep - 06 Oct	Porter Airlines (Canada) Ltd
28 Sep - 05 Oct	WestJet
26 Sep - 05 Oct	WestJet
23 Sep - 30 Sep	Porter Airlines (Canada) Ltd
20 Sep - 27 Sep	Air Transat
18 Sep - 28 Sep	WestJet
21 Sep - 28 Sep	WestJet
22 Sep - 30 Sep	WestJet
22 Sep - 29 Sep	WestJet
19 Sep - 26 Sep	WestJet
17 Sep - 24 Sep	WestJet
18 Sep - 26 Sep	WestJet
18 Sep - 26 Sep	Air Canada	direct

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 795€

Return flights