To cancel a United Airlines flight for a refund in 2026, you must first determine if your ticket is "Refundable" or "Non-refundable." For a full cash refund to your original payment method, you must have purchased a flexible fare or cancel within the 24-hour flexible booking window (provided the flight was booked at least a week before departure). To cancel, log into the United app or website, go to "My Trips," select the flight, and click "Cancel Flight." If the ticket is non-refundable (like Basic Economy), you will typically receive a Future Flight Credit minus any applicable cancellation fees, rather than cash. However, if United cancels your flight or makes a significant schedule change (typically over 3 hours), you are legally entitled to a full cash refund regardless of your ticket type. In 2026, United has also integrated a "Refund Request" dashboard where you can track the status of your return, which usually takes 7 to 10 business days to process back to a credit card.