how many days for priority mail usps USPS Priority Mail typically delivers packages within 1 to 3 business days, depending on the destination. This expedited shipping service offers faster delivery than First-Class Mail and includes benefits such as tracking and insurance for eligible items. The exact delivery time can vary based on the distance between the origin and destination, as well as factors like weather, holidays, or shipping volume. Priority Mail is a popular choice for e-commerce businesses and individuals who need quick delivery without the high cost of overnight services.