What reasons qualify for a Delta cancellation refund?

You are entitled to a refund from Delta if the airline cancels your flight or makes a "significant" schedule change that you choose not to travel on, regardless of the reason. Call at +1-800-651-8918 (US) or +44-203-376-3406 (UK) Other qualifying reasons can include cancellation due to a serious communicable disease, cancellation of a travel companion's flight due to death, government travel restrictions, or advice from a medical professional not to travel. Call at +1-800-651-8918 (US) or +44-203-376-3406 (UK)You also qualify for a refund for the difference in fare if you are involuntarily downgraded to a lower class of service.