Hi Raduga, Bariloche is easily reachable by
Argentina flights from Buenos Aires and when I traveled it took only 2 hrs. But if you decide to travel only by bus then Argentina offers excellent bus service, and is no exception to travel by to Bariloche. And if you drive a car, then can take National Route 3, continue National Routes 2 and 22 and finally take National Route 237 to reach Bariloche. It takes from 20 to 22 hours, so better go by flight :)