Audur studied at the Reykjavík Academy of Singing and Vocal Arts with Ólöf K. Harđardóttir and the Hochschule für Musik und darstellende Kunst in Stuttgart, where she passed her final exam with distinction. Her teachers were Prof. Luisa Bosabalian and Carl Davis. She has also participated in master classes given by Brigitte Fassbaender, Renata Scotto and Hermann Prey. She was employed at the Stadttheater Würzburg where she sang the leading soprano roles in numerous opera productions. She has appeared as a guest artist in many of the main opera houses in Germany and at the Icelandic Opera.
Audur is an experienced concert singer and has given many recitals and performed in oratorios in Germany, Iceland and North America. She has appeared with the Iceland Symphony Orchestra and various orchestras in Germany. She can be heard on several CDs.