You can cancel your tickets and even apply for a refund of your total booking amount, only if the tickets are refundable and purchased directly from Singapore Airlines. For a clear idea of your refund eligibility, you can check the Singapore Airlines cancellation Policy.
If you are canceling a non-refundable ticket fare, the airline will only refund your taxes. The refund amount will be credited back to the original source of payment. The airline might apply a cancelation or service fee in some cases. Each ticket has its refund application validity mentioned on it. In order to apply for a refund, please make sure to cancel your reservation and apply for a refund within the time limit.
If you are traveling to or from the United States, you can cancel your Singapore Airlines reservations within the first 24 hours of your booking. However, you can qualify to benefit from the service only when your booking was made at least seven or more days before your departure date. If you want to ensure that you would be getting a complete refund or not, then you can cancel your reservation by visiting a nearby ticketing office of Singapore Airlines.
It is advised for you to read all the terms and conditions attached to your ticket fare before making a reservation on the airline’s website or at a local ticketing office.