is usps priority mail fast? USPS Priority Mail is one of the fastest services offered by the United States Postal Service. It typically delivers packages within 1-3 business days, depending on the destination. This service is popular for both personal and business shipments because it provides quick and reliable delivery for time-sensitive packages. The delivery time can vary based on factors like distance and package size, but it generally offers a good balance between speed and cost. Priority Mail also includes tracking and insurance for added security, making it a dependable choice for urgent shipments.