Also, this delivery guarantees the money back in case the package is not delivered on Sunday. The Priority Mail Express is the is the best option for you if you want the package to be delivered on Sunday or Saturday. It is a guaranteed delivery option which works for most of the U.S. Not only Sunday, but Saturday deliveries are also included in the Priority Mail Express option. SEE ALSO Delivery Times and the Features of All USPS Services and Mail-Class You can read more about USPS Sunday Delivery. You can avail this service any day of 365 days in a year. As you have read above, the Priority Mail Express takes maximum 1-2 days. The mail delivery days on weekends is limited other than Amazon packages and Priority mail express. On Sundays, USPS also delivers the Amazon packages. But, on Sundays, it delivers only the items that are sent using Priority Mail Express service of USPS as the Priority Mail Express works on 365 days of the year. From Monday to Saturday, the USPS delivers all kind of mail class and all types of packages. USPS delivers the package to the customers all the seven days of the week.
The Shipping times of the domestic mail category is in the table below: USPS Domestic Mail Class
USPS: Difference and Which is Cheaper UPS or USPS? USPS Shipping Times: