When you cancel a non-refundable ticket, it will only charge you the tax at the time of cancellation.
It’s worth noting that aspirants don’t have to pay anything for cancellations due to emergencies.



Singapore Airlines Cancellation Policy, Cancel Flight Ticket & Refund Policy

Yes, Singapore Airlines does have a 24-hour cancellation policy. According to this policy, all passengers can cancel Singapore airlines flight ticket within 24 hours.