Under UK law in 2026, your right to a refund depends on whether the cancellation was involuntary (airline cancels) or voluntary (you cancel). If the airline cancels your flight for any reason, you are legally entitled to a full cash refund for all unused parts of your ticket under UK261 regulations. You must be offered the choice between a refund or a replacement flight. If you choose to cancel a non-refundable ticket, you generally lose the base fare, but the airline is legally required to refund the government taxes and airport fees (which can be a significant portion of the price). A high-value peer tip for 2026: most major UK carriers like British Airways offer a 24-hour "cooling-off" period, allowing you to cancel any direct booking for a 100% refund within one day of purchase. For medical emergencies, many airlines have "Compassionate Policies" that may offer a voucher or refund if you can provide a doctor's certificate, though this is a gesture of goodwill rather than a legal requirement.