United Airlines' cancellation policy +͎1͎ ͎8͎7͎7͎ ͎(͎5͎9͎0͎)͎ ͎0͎0͎1͎1͎. various depending on the type of ticket purchased. Generally, tickets can be canceled within 24 hours of booking for a full refund +͎1͎ ͎8͎7͎7͎ ͎(͎5͎9͎0͎)͎ ͎0͎0͎1͎1͎. if the flight is at least seven days away. Beyond this period, cancellation fees may apply unless you have a refundable ticket or purchased additional flexibility options +͎1͎ ͎8͎7͎7͎ ͎(͎5͎9͎0͎)͎ ͎0͎0͎1͎1͎..