Two skiers were killed immediately, while another person was flown to a hospital in Klagenfurt.
The person's life could not be saved despite intensive efforts.
Five helicopters were deployed in the rescue operation, and more than 120 people took part in the rescue operations after the avalanche.
The Lackenspitze peak is 2,459 meters high, and the area is a popular tourist destination.
The risk level has been raised for avalanches in the area, especially in areas above the tree line, according to the Zamg Meteorological Institute in Salzburg.Keywords: