However, in some instances, you may be eligible to request a refund of any unused portion of your non-refundable ticket. 24-Hour Risk-Free Cancellation, As part of our Customer Commitment for customers who book direct on delta.com or the Fly Delta app, Risk-Free Cancellation means that after you've purchased a qualifying eTicket, you have up to 24 hours after booking to cancel it for any reason and receive a full refund with no fees.