Oscarrr5 – https://www.travomojo.com/flight-change-policy/singapore-airlines-flight-booking-change/

Singapore Airlines occasionally provides special fares, which may have varying change costs and conditions. Customers should carefully read the terms and conditions of their bought fare to discover the change fee that applies to their booking. Furthermore, depending on their membership category and status, Singapore Airlines frequent fliers may be eligible for reduced or waived change fees.