A company called AEROCAR runs buses from Grenoble to Geneva Airport. Their buses depart from the Grenoble bus station, which is easy to get to from the ski resorts nearby. They arrive at the international terminal at the airport.
AEROCAR airport buses are nice Grand Tourisme coaches that hold up to 45 passengers. They have lots of luggage storage space for your bags and skis.
Buses from Grenoble to Geneva Airport depart five times a day. Departures take place at 6:00, 8:30, 11:15, 13:30, and 15:30.
The scheduled travel time on this route is 2 hours and 15 minutes. The trip can take longer if the weather is bad or if there is heavy traffic. As such, make sure to leave yourself plenty of time to get to the airport before your flight.
Tickets for buses from Grenoble to Geneva Airport cost 42.50 euros for singles and 53.00 euros return if you book online in advance. If you by them at the airport, tickets cost 46.50 euros for singles and 58.00 euros return.