usps expedited shipping rates are higher than standard shipping options, but they offer faster delivery times. For example, USPS Priority Mail offers delivery within 1-3 business days, while Priority Mail Express guarantees overnight delivery. The cost of expedited shipping varies based on the size, weight, and destination of the package. USPS offers flat-rate pricing for Priority Mail, which can be an economical option for heavy or bulky items. For international shipments, USPS also offers expedited services like Priority Mail Express International, with delivery typically within 3-5 business days to most countries.