Bariloche is located 1650 kilometers from Buenos Aires, the capital of Argentina, that is approximately two hours flight. Buenos Aires is well connected through many international airlines. This is a list of some airlines with direct flights to Buenos Aires:

Aerolíneas Argentinas
Air Canada
Air France
Alitalia
American Airlines
British Airways
Iberia
Lan Chile
Lufthansa
Mexicana
United Airlines
Varig

All international flights arrive at Ezeiza International Airport. To continue to San Carlos de Bariloche passengers have to transfer to Aeroparque, the airport for domestic flights located near the city center.

From EZEIZA to Aeroparque (Jorge Newbery Airport)

Manuel Tienda Leon runs a bus service with frequent departures from Ezeiza International Airport to Aeroparque. There are also several taxi or "remises" companies with reservation booths inside the airport.  Passengers are adviced to take only buses and taxis clearly identified with official markings. Beware and avoid accepting offers of lower fares in unmarked taxicabs.

From Aeroparque to Bariloche

 
There are three airlines connecting Buenos Aires with Bariloche:

Aerolíneas Argentinas
Austral
Lan
 

Ground transportation from Buenos Aires to Bariloche

If you decide to travel from Buenos Aires to Bariloche by bus, a journey of around 20 hs., there are several bus lines departing from the bus terminal (Retiro).