Here is a pdf with complete pricing details.

Portes du Soleil Pass	Adult	Child*	Senior*	The lift ticket system in the Portes de Soleil is a hands-free pass (price: €3) that you can keep in a pocket. Simply pass by a scanner that picks up data from a computer chip on the ticket and ride. This system makes it easy to add time or regions to your ski pass electronically at any ticket office. Snowboarders can get a lift pass that gives them access to a few chairlifts around the snowparks above Avoriaz. *The age for children is 5–15 years old. Identification is required for skiers age 12 and older. Seniors are age 61 and older. Children younger than 5 ski free. AXA Snow Risq Neige assistance insurance costs €2.80 per day for an adult and €2.30 per day for a child.
One day	€39	€26	€31
Three days	€108	€72	€86
Five days	€168	€113	€134
Seven days	€225	€151	€180