what’s the difference between express and priority mail is an important question for those who need fast shipping. USPS Priority Mail is typically a 1-3 day service depending on the destination, and it’s often the more affordable option. It includes tracking and insurance up to $50, but delivery times are not guaranteed. On the other hand, USPS Priority Mail Express guarantees overnight delivery to most locations, with tracking and insurance included up to $100. Priority Mail Express is faster and more expensive, making it ideal for urgent shipments. Both services are reliable, but the key difference lies in the delivery speed and cost.