Whether you can change the time on a Deutsche Bahn (DB) ticket depends entirely on the fare type you purchased. If you have a Flexpreis (Flexible Fare) ticket, you are not bound to a specific train; you can board any train on the booked route during the ticket's validity period (usually the entire day), effectively changing your time at will. However, if you purchased a Sparpreis (Saver) or Super Sparpreis ticket, these are "Zugbindung" (train-bound), meaning they are only valid for the specific time and train number printed on the ticket. To change these, you must typically cancel the original ticket (if the fare rules allow it, usually for a €10 fee returned as a voucher) and book a new one at the current price. In 2026, DB offers a "180-minute instant cancellation" window where you can void any booking for free within three hours of purchase if you made a mistake. If your specific train is delayed by more than 20 minutes, the "Zugbindung" is automatically lifted, and you may take any other available train to your destination.