us postal service international postage rates are the fees associated with sending packages or letters to destinations outside the United States. USPS offers several international shipping options, including First-Class Mail International, Priority Mail International, and Priority Mail Express International. Rates vary based on the weight, size, and destination country of the package. For example, First-Class Mail International is typically the most affordable option for small items, while Priority Mail International provides faster delivery with additional features like tracking and insurance.