Hello Che03
You can calculate and book international connections directly online. Please consider that an online price calculation is possible maximum 3 months ahead under the link:
https://sbb-tickets.cc/en/ticketshop/b2c/adw.do?7731
Give the start and destination of your connection and chose the desired travelling time. Follow further instructions. The booking system shows you the available rates. If the system can’t calculate the journey, you will be shown a request form. In that case you will get an offer via email in the 48 hours.
Instruction for the SBB Ticket Shop is available under the following Internet address:
https://sbb-tickets.cc/en/travelcards-and-tickets/buying-options/online.html
Greetings, ValerieS