us postal overnight shipping rates

us postal overnight shipping rates depend on the weight, size, and destination of the package. USPS offers Priority Mail Express, which is its fastest overnight shipping service. Rates for Priority Mail Express can range from $26.35 for a small flat rate envelope to over $100 for larger packages, depending on size and destination. Additionally, USPS offers other options for expedited delivery, but for true overnight delivery, Priority Mail Express is the fastest and most reliable option.