You can contact +44(800)368-6370 (OTA) for Swiss Airline cancellation executives. You can cancel your ticket and receive a full refund under Swiss Airlines' 24-hour cancellation policy, irrespective of your ticket type. But the condition is your departure date should be 7 days away, if you are past your 24-hour window period, then you will have to pay cancellation charges as per Swiss Air cancellation policy. After 24 hours of booking, whether you will get a full refund or not is completely based on your ticket type; for example, basic economy tickets are non-refundable as per Swiss Airlines cancellation policy. Also, whether you can cancel an Air's ticket depends on your fare type.