overnight envelope cost usps

overnight envelope cost usps varies depending on the destination and the weight of the envelope. For USPS, the cost of sending an overnight letter or envelope is typically calculated based on the service level, such as Priority Mail Express. This service guarantees overnight delivery by 10:30 AM to most locations. As of recent rates, the cost for an overnight envelope using USPS Priority Mail Express can range from $26.35 for a flat rate envelope to higher rates depending on the delivery zone and size.