Yes, there are multiple flights from Canada to Oulu for under C$ 1,381. The cheapest flight booked recently is on Finnair for just C$ 1,334, but on average you can expect to pay C$ 1,335.
There are no direct flights from Canada to Oulu, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
Departing from Canada to Oulu will take you 17h 23m.
Flying on Finnair is currently your cheapest option to Oulu, with prices starting at C$ 1,334.