The bus service is provided by the company Mi Bus (http://www.mibus.com.ar/bariloche/). It offers several tour routes.
The one that stands out is the line that follows Bustillo Avenue, from the Bus Station to the Llao Llao Hotel (located on milestone 25), which runs across downtown Bariloche and stops in front of the Villa Huinid hotel.
There is also a line 72 bus that goes from the center to the airport. It begins its tour at the parking lot in Bariloche airport and gets to the stop on Moreno street, between Palacios and Rolando, at the center of the city. It operates daily from 6.40 am to 10.40 a.m.
On the company page you can see the routes and schedules of the different bus lines, bear in mind that the line that connects the city center with the airport has limited hours
The ticket is paid with and unique personal card SUBE electronic ticket system, this card can be obtained or charged at different points of sale.
More information in: https://www.argentina.gob.ar/sube.
Another transportation alternative in Bariloche is taking a taxi or remise. Taxies are white and light blue, have specific stops at the center of the city but may be hailed to stop in any street by signaling with a hand.
Remises may be requested by phone or personally, at the agencies.
More information in: https://www.barilocheturismo.gob.ar/es/transporte-publico