Lyon airport is a an almost identical distance from Tignes ski resort as Grenoble airport (219km) and has a very similar transfer time of just under 3 hours.
Once you are out of the mountain roads the journey passes by very quickly on the modern French highways, and access to Lyon airport is very efficient.
Although private transfers are easily arranged, shared transfers between Lyon airport & Tignes are much harder to find due to the reduced number of passengers using this transport route.
Compare transfers between Lyon airport & Tignes ski resort