If you’re looking to avoid penalties or fees when canceling a Singapore Airlines flight, providing sufficient notice is key. Singapore Airlines allows a 24-hour grace period during which passengers can cancel their flight for a full refund, provided the booking was made at least a week before departure. Beyond this, the terms of your fare class will dictate the cancellation rules. Refundable tickets can typically be canceled up to the day of the flight without fees, while non-refundable tickets may incur penalties or offer only partial refunds or credits. For the best outcome, it's always ad****ble to cancel as early as possible.