What is the cancellation policy for United Airlines? Yes, United Airlines allows cancellations. Tickets are fully refundable within 24 hours of booking, provided the departure date is more than two days ahead. For more details, call 1-888-415-1245. What is United Airlines' cancellation policy? United Airlines provides a flexible 24-hour cancellation policy. This allows passengers to cancel their bookings within 24 hours of ticket purchase and receive a full refund, regardless of the fare selected. For cancellations and immediate refunds, you may contact their toll-free number at 1-888-415-1245.