By Air: Geneva International Airport (194km) is the closest international airport to La Plagne that offers good flight choices & transfers. You can check the link for more information regarding the airport transfers from Geneva Airport: https://www.gva.ch/en/desktopdefault.aspx/tabid-76/
Lyon Airport, situated 215km away can also be an option.
By Train: The nearest train station is Aime – La Plagne (17km away). There are buses between the train station & ski resort, you can check the link for further information: http://www.mobisavoie.com/jeton/index
*Airport transfer is not available for Ski France tours.