How do I contact United Airlines customer care to cancel flights? United Airlines operates a 24-hour cancellation policy. If you cancel a flight within 24 hours of departure, fees apply. The fee varies based on your ticket type. For non-refundable United tickets, there's no refund. Refundable tickets receive repayment minus the fee. To cancel, contact United Airlines customer service at USA: 1-800-864-8331 or OTA: +1-800-971-7347. The customer care team is dedicated to helping you. https://skyairbus.com/blog/does-united-have-24-hour-cancellation-policy-skyairbus/