Passengers can cancel a flight booked through Singapore Airlines up to 24 hours after making their purchase, per the airline's 24-hour cancellation policy. If you cancel your flight with Singapore Airlines one week or more prior to departure, you will receive a full refund of the price of your ticket. Singapore Airlines has the right to modify the cancellation at any time.As per the Singapore Airlines Refund Policy, Just those flyers who have purchased refundable tickets can guarantee discounts