USPS typically aims to deliver mail and packages by 5:00 p.m. local time Monday through Saturday, which is considered the standard delivery window
. However, deliveries can sometimes extend beyond this time due to unusual circumstances such as traffic, staffing issues, severe weather, or high volume during peak seasons like the holidays
. It is not uncommon for USPS carriers to deliver as late as 6:00 p.m. or even later, with some reports of deliveries occurring as late as 8:00 p.m. or 9:00 p.m. in rare cases
. During busy periods, carriers may work well into the evening to complete their routes
. On Saturdays, USPS delivers from about 9:00 a.m. to 5:00 p.m., with most packages arriving by 2:00 p.m., but deliveries can extend as late as 6:30 p.m. during peak times
. Sunday deliveries are limited to Priority Mail Express and certain Amazon packages, with delivery times generally by 10:30 a.m. or up to 6:30 p.m., and sometimes as late as 10:00 p.m. for Amazon shipments
. In summary, while the official USPS delivery window is roughly 8:00 a.m. to 5:00 p.m., actual delivery times can vary and extend into the evening, especially during busy seasons or due to unforeseen delays
