Cancel your non-refundable ticket either online or by calling Frontier Airlines' reservation department at 800-4321-FLY (800-432-1359). Note the cancellation confirmation number the reservation specialist provides, and retain the original ticket confirmation number. This cancellation must be completed before the original scheduled departure date.
Call Frontier Airlines' reservation department when you are ready to rebook a flight, within one year of the original cancellation. Make sure to have the original ticket confirmation number and cancellation number handy.
Rebook the flight for a date within one year of the original cancellation with the reservation specialist. You may be forced to pay a ticket change fee, but your ticket will be valid for the original destination and transit route, with its original value retained.