Loncar attended a ballet school in Belgrade and came in the late 1950s to her first television appearances. As a television announcer introduced them to children's programs and received 17 -year-old her first film roles.
Discovered by director Franz Antel 1962 for the international film, she appeared during the 1960s and 1970s in many European productions. Your profession were popular at that time, produced by various European film studios in large numbers thrillers, espionage thrillers, westerns and comedies. In 1982, she withdrew.