priority mail deliver on saturday refers to the ability of USPS to deliver packages sent via Priority Mail on Saturdays, providing customers with an extended delivery window. Priority Mail offers fast delivery within 1 to 3 business days, and USPS ensures that packages are delivered even on Saturdays. This service is ideal for businesses and individuals who need to ensure that their packages are received promptly, including over the weekend. Priority Mail also includes tracking, and customers can opt for additional services such as signature confirmation for added security.