There are many ways to get to Val Thorens from the airport. For this, you can opt for comfortable bus transportation. If you have landed at Geneva airport, bus transportation from the area is provided by www.alpski-bus.com or www.coach-station.com.
Train connections can be found on the website. You should consider the fact that the price will be more reasonable if you buy a round-trip ticket at once. There are also trains and buses from Chambéry or Lyon airports, which will cost around 70-90 EUR per person.
From either airport you can still get to Val Thorens by car. To do this, first head to Chambery, then take the four-lane Moutiers highway and follow it to the Les Trois Vallees sign. In proportion to the three valleys, Val Thorens is on the right hand side.