The ski season in Courchevel is scheduled to open on December 7 in this (2019) year. There is not much time left before the season, so you should hurry if you plan to ski here. It is better to buy plane tickets and book a hotel room in advance.
Most likely, only some of the highest slopes will be open first. The best time for skiing will come sometime later.
Airline tickets to Geneva can be bought here - - http://air.visit-plus.com (Next to the field indicating the number of passengers, you can choose a business class, if necessary.)