Aros made his international debut for Chile on April 29, 1998 against Lithuania. He was a participant at the 1998 FIFA World Cup with Chile. He only played in one game at the '98 World Cup, which was in the Round of 16 match versus Brazil. Aros participated in three Copa América's (1999, 2001, and 2004). In the 1999 Copa América, Chile made it to the semifinals against Uruguay. The game went to penalties and Aros missed the second penalty shot, which would prove to be the decisive penalty for Chile. Chile went on to lose the third place game versus Mexico. His last international match was against Costa Rica on July 14, 2004 in a group match of the 2004 Copa América. Aros finished his international career with 30 caps.