How Do You Cancel Usps Passport Appointment? (Guide) This happens. Whatever it is, you realize you need to cancel your USPS passport appointment. There are many people who want to know how you can cancel a USPS appointment. The same question intrigued me, so read on to see what I found! How Do You Cancel USPS Passport Appointment In 2022? For cancellations of USPS passport appointments, visit the USPS retail customer appointment scheduler (RCAS). You will then need to input the appointment number along with your email and phone numbers into RCAS. Finally, click “Manage Appointments”, which allows you to…