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

Return flights

03 Sep - 24 Sep	Porter Airlines (Canada) Ltd
01 Sep - 08 Sep	Porter Airlines (Canada) Ltd
02 Sep - 23 Sep	Air France
10 Sep - 01 Oct	Air France
09 Sep - 30 Sep	Air France
16 Sep - 26 Sep	Air France
17 Sep - 23 Sep	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Ottawa to Oslo 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 Oslo in September from 616€

Return flights