us postal service priority mail shipping time is typically 1-3 business days within the United States, depending on the destination. USPS Priority Mail is one of the fastest affordable shipping options for domestic deliveries, offering both speed and reliability. The service includes tracking and delivery confirmation, and packages are typically delivered in 1-3 days, with some locations receiving packages faster. Priority Mail is also a popular choice for customers who need expedited shipping without the cost of Express Mail services.