usps priority postage rates USPS Priority postage rates refer to the pricing structure for sending packages through USPS Priority Mail services. This service offers expedited delivery with various options, including flat-rate boxes, regional rate boxes, and weight-based pricing. USPS Priority Mail typically delivers packages within 1 to 3 business days, depending on the distance between the sender and recipient. USPS provides discounted rates for businesses, and their pricing is based on factors like package size, weight, and destination, making it an affordable option for fast shipping.