Travel
We highly recommend booking a rental car while you are in Switzerland. There is no Uber or Lyfts in Sion or Sierre, but there are a few taxis. You can book taxi rides via this website https://www.local.ch/en/q/sion/taxi. We also recommend asking your hotel to make arrangements if needed.
If you are not booking a car and need to take the train to Sion from Geneva here are some instructions:
The fastest trains from Geneva Airport to Sion take around 1 hour and 52 minutes.
The first train leaving Geneva Airport is around 05:19h. The last departure is usually around 22:49h. They leave approximately every 13 minutes. Prices for a one way ticket start at US$18.71, but increase as you get closer. We recommend purchasing semi-flexible tickets which allow you to change the timing within the same day if needed. Double check the route before purchasing, it should not require you to change trains since there is a direct line.