usps priority transit times refer to the estimated delivery times for USPS Priority Mail services, which typically offer delivery within 1-3 business days, depending on the destination. Priority Mail is an affordable option for shipping packages that need to be delivered faster than First-Class Mail but without the higher costs of overnight services. The transit time for Priority Mail is generally reliable, though exact delivery windows can vary based on factors like weather conditions or volume of shipments. For e-commerce businesses, offering USPS Priority Mail ensures customers receive their packages quickly and efficiently.