SBB-CFF Swiss railways

Look up train schedules here: http://www.sbb.ch/

Earliest connections from Mont-Soleil to the Swiss airports:

Departure Mont-Soleil at 6:25

Monday-Friday (Saturday one hour later, Sunday two hours later)

Latest connections from the Swiss Airports to Mont-Soleil:

Arrival Mont-Soleil at 23:44

Friday and Saturday (Sunday-Thursday 3 hours earlier!)

The Décentrale is just a two minutes walk away from the Mont-Soleil station.