For assistance with your specific situation, call Delta support team at ???? +????*(855 550 0189] for accurate information. In most cases, if the cancellation is within the free cancellation window, the One Key Cash may be refunded. However, there may be exceptions. Yes, Delta has a 24-hour cancellation policy. customers receive a full refund if they cancel within 24 hours of booking. https://www.devex.com/people/delta-cancellation-what-is-delta-cancellation-policy-2016766