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

Earliest connections from Mont-Soleil to the Swiss airports:

Departure Mont-Soleil at 6:25

• Arrival Geneva Airport 8:54
• Arrival Basel Airport 8:51
• Arrival Zurich Airport 8:42
• Arrival Berne Airport 8:39

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

• Departure Geneva Airport 21:02
• Departure Basel Airport 21:07
• Departure Zurich Airport 21:13
• Departure Berne Airport 21:18

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

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