United Airlines allows passengers to cancel their flights, with terms depending on the type of fare purchased. A 24-hour grace period applies to most tickets, offering a full refund. However, non-refundable tickets may incur cancellation fees, and Basic Economy tickets typically can’t be refunded. For refundable tickets, a full refund may be issued after cancellation. To check your flight’s eligibility, visit the United website or contact customer service for personalized assistance with your cancellation.