The closet airport is Geneva Cointrin (GVA) at 149 km (93 miles) distance. The airport of Lyon is 180km (111 miles) away. Courchevel also has its own little airport for private planes and helicopters.
Busses and shuttles connect the village with the main airports. The railways reaches Moutiers from there you can get a taxi or a shuttle up to the resort.
If you are driving to Courchevel, follow the signs to Chambery and Albertville, then take the road to Moutiers and up to les Trois Vallees. Once you get here, you can easily move around with shuttle buses within Courchevel, and between the villages of each valley.