USPS delivery times vary depending on the mail service used and the destination. Here is an overview of typical delivery times for common USPS services within the U.S.:

• First-Class Mail: Usually delivered within 1 to 5 business days, often 1 to 3 days for smaller packages and letters. However, delivery is not guaranteed and delays can occur; recent trends show it may take up to 5 days or sometimes longer, especially for cross-country shipments

• Priority Mail: Typically delivers in 1 to 3 business days, depending on origin and destination. This is USPS's bestselling service for domestic shipments

• Priority Mail Express: Offers overnight to 2-day delivery with a money-back guarantee and is the fastest domestic service available, including Saturday delivery

• USPS Retail Ground, Media Mail, Parcel Select: These economical options generally take longer, ranging from 2 to 9 business days depending on the specific service and distance

Delivery usually occurs between 8 a.m. and 5 p.m., but during busy seasons or due to delays, USPS carriers may deliver later into the evening, sometimes as late as 7 to 9 p.m.

. Sunday delivery is generally not offered except for Priority Mail Express in some areas. In summary, for standard mail expect 1-5 business days, Priority Mail 1-3 days, and Priority Mail Express overnight to 2 days. Delays can extend these times, especially during peak seasons or for long-distance shipments