Yes, holding the Swiss Travel Pass, you are welcome to purchase
- a point-to-point class upgrade,
- a day class upgrade, or
- a saver point-to-point class upgrade
and all these, at half fare (½).
On the SBB Mobile app, go to the Profile tab and check the Half Fare Travel Card option. By doing so, you will be able to buy class upgrades at a reduced fare.
Upon ticket inspection, present your STP and your class upgrade.