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. https://www.transfermarkt.com/what-is-1-8-5-5-5-5-0-0-1-8-9-delta-cancellation-policy-/thread/forum/659/thread_id/5780/page/1#anchor_5861