DB tickets are available 90 days in advance. 

There are three ticket types available for cheaper travel: Saver-Ticket, Europa-Spezial Ticket and Sparpreis Ticket. 

These tickets are available for travel within Germany as well as travel from Germany to other countries such as Italy, Denmark, Sweden, France and Switzerland. 

The refund and exchange policies differ for each of these ticket types; please take a look at them on the booking page before purchasing your ticket.