how much does it cost to send a package overnight depends on the carrier and service level selected. For USPS, the cost for overnight delivery through Priority Mail Express starts at approximately $26.35 for a small flat-rate envelope. Prices vary depending on the weight, size, and destination of the package, and more expensive options like FedEx or UPS overnight delivery typically start at higher rates. Expedited shipping options often come with a price premium, especially for heavier or larger packages. When sending a package overnight, customers should consider the urgency of the delivery and balance cost with speed. For businesses, offering overnight shipping can be an attractive selling point, but it’s essential to ensure that the associated costs align with the overall pricing strategy.