us postal service time to deliver varies depending on the service chosen and the destination. For example, First-Class Mail typically delivers within 1–3 business days, while Priority Mail offers delivery within 1–3 business days, depending on the location. USPS also provides international delivery services, with times varying by country and service level. The delivery times for services like Media Mail or Parcel Select may take longer, while expedited services like Priority Mail Express guarantee next-day delivery. USPS provides estimated delivery windows for each service, but delays can occur during high-volume seasons or due to weather conditions.