Learn the complete United Airlines cancellation policy, refund rules, 24-hour cancellation, fees, and step-by-step process. Call +1-800-942-0512 for instant help. Introduction If you booked a flight with United Airlines and need to cancel it, understanding the rules can save you money and stress. This guide explains everything in simple language—fees, refunds, and exact steps. ForUnited Airlines Cancellation Policy (2026): Fees, Refund Rules & Easy Steps +1-800-942-0512