If the award ticket allows a refund, KrisFlyer miles of completely unused award tickets or upgrade awards may be redeposited for a fee provided the KrisFlyer miles and the ticket are valid at the time of redepositing. Any taxes will be refunded.
KrisFlyer miles cannot be refunded for partially used award tickets and upgrade awards."If you redeemed a ticket that allows a refund, a cancellation fee will be charged to refund the cost of the flight segment that has not been flown, including taxes on it. For a non-refundable ticket, only the taxes on the flight segment that has not been flown will be refunded.