Swiss Airlines typically charges fees for changing flights, and their policy varies based on the type of ticket purchased and the specific fare rules. Here are some general guidelines:

Basic Economy Tickets: These tickets are usually non-refundable and changes are not allowed (except during the pandemic, policies may vary). If changes are permitted, a fee plus any fare difference will apply.

Main Cabin and Premium Economy: Changes are generally allowed for a fee, plus any difference in fare. The exact fee depends on the fare rules and the time of the change.

Business and First Class: These tickets typically have more flexibility with changes and may incur lower fees compared to economy tickets. Some premium tickets might even allow changes without a fee.

Elite Status: Swiss Airlines' frequent flyers with elite status may receive waived fees or reduced fees for changes, depending on their status level.

Same-Day Flight Changes: If you want to change to a different flight on the same day, Swiss Airlines offers this option for a fee, provided there is availability.

It's important to check the specific fare rules associated with your ticket type, as they dictate the fees and conditions for changes.