USPS Priority Mail Express
What is Priority Mail Express?
USPS Priority Mail Express is a guaranteed way to send documents and packages to a destination overnight or in one to two days on any day of the year, including Sundays and holidays. If the US Postal Service doesn’t deliver your package on time, they will refund the full delivery cost to you. Items under 70 pounds can be sent through Priority Mail Express to any address in the United States. Priority Mail Express comes with up to $200 in insurance and delivery tracking for free.
USPS is the only overnight shipping carrier that is allowed to deliver packages to a P.O. Box address. Other carriers, such as UPS and FedEx, are not able to deliver packages to mailboxes in the Post Office.
USPS uses zone-based pricing for Priority Mail Express. There are 9 zones in the United States. Prices are based on the distance from the original package location to the delivery destination. Prices start at $26.95 and up and up at the Post Office and $23.50 and up and up for Stamps.com customers. Additional fees apply for packages that must arrive on Sundays or holidays.