is priority mail faster is a common question when comparing USPS shipping services. Priority Mail offers faster delivery compared to First-Class Mail. While First-Class Mail typically takes 1-3 business days for domestic delivery, Priority Mail guarantees delivery within 1-3 business days, regardless of the destination within the U.S. Additionally, Priority Mail includes free tracking and up to $50 in insurance coverage, while First-Class Mail does not include such services. Priority Mail is ideal for heavier packages (up to 70 lbs) and those that require faster delivery times, such as for business or time-sensitive items.