How To Request For United 24 Hour Cancellation Policy? The United 24 hour cancellation policy applies to most flights booked directly with United within 24 hours of purchase, provided the flight is at least seven days from the departure date. You can usually request a cancellation within this 24-hour window through the "My Trips" section on united.com, the United app, or by contacting United customer service. A full refund will typically be issued to the original form of payment. Get more precise information from the consolidation desk at +1-800-865-1848. https://www.flyingrules.com/cancellation-policy/united-airlines-cancellation-policy