United Airlines offers a flexible cancellation policy to accommodate passengers' changing travel plans. Within 24 hours of booking, customers can cancel their flights and receive a full refund, provided the booking was made at least seven days before departure. After this window, cancellation fees may apply depending on factors such as fare type and timing of cancellation. Passengers can easily cancel their flights online through United's website or mobile app, or by contacting United's customer service. Refunds are typically issued to the original form of payment within the specified processing time. It's important to note that certain fare types, such as Basic Economy, may have different cancellation terms. Additionally, United may provide exceptions for circumstances like medical emergencies or severe weather disruptions. Passengers are advised to review United Airlines Cancellation Policy and fare rules before making changes to their itinerary.