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

Return flights

01 Sep - 22 Sep	WestJet
14 Sep - 28 Sep	WestJet
10 Sep - 24 Sep	WestJet
05 Sep - 15 Sep	WestJet
30 Sep - 16 Oct	WestJet
01 Sep - 01 Oct	Air Canada
17 Sep - 08 Oct	Air Canada
01 Sep - 08 Sep	WestJet
03 Sep - 10 Sep	WestJet
09 Sep - 23 Sep	Porter Airlines (Canada) Ltd
16 Sep - 07 Oct	WestJet
29 Sep - 10 Oct	Air Canada
02 Sep - 09 Sep	Porter Airlines (Canada) Ltd
26 Sep - 06 Oct	WestJet
12 Sep - 18 Sep	WestJet
26 Sep - 02 Oct	WestJet

Also check the deals for one-way flights from Ottawa 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 Ottawa to Seoul in September from 646€

Return flights