Refer to the individual Domestic mail class for more information. Times given below are estimates. Domestic Classes of Mail Estimated Delivery Time Class of Mail | Estimated Delivery Time | Trackable | Guaranteed
(money back if not on time) | | Express Mail service (PO to Addressee) | Items are delivered to the addressee (recipient) by noon or 3:00 p.m. the next day, or noon or 3:00 p.m. the second day. | Yes | Yes | | Express Mail (PO to PO) | Items are available for collection by the recipient by 10:00 a.m. the next day or second day (or next day or second day that the destination Post Office is open for retail business). | Yes | Yes | | . | | Priority Mail service / Priority Mail Flat Rate | Typically two to three days to most locations in the US (Specific delivery standards may be available when postage is calculated). This is not a guaranteed service. | No | No | | First-Class Mail | Estimated delivery time is two to three days. | No | No | | . | | Parcel Post | Typically 2 - 9 days in the 48 contiguous states for most origins / destinations. Specific time standards may be available when postage is calculated. Estimated delivery time between Alaska / Hawaii / Puerto Rico and the contiguous 48 states is calculated by entering the origin and destination information into the Postage Price Calculator located in usps.com. Estimated delivery time within Alaska / Hawaii / Puerto Rico addresses is calculated by entering the origin and destination information into the Postage Price Calculator located in usps.com . | No | No | | Bound Printed Matter / Media Mail | For most origins / destinations, specific time standards may be available when postage is calculated. Estimated delivery time between Alaska / Hawaii / Puerto Rico and the contiguous 48 states is calculated by entering the origin and destination information into the Postage Price Calculator located in usps.com. Estimated delivery time within Alaska / Hawaii / Puerto Rico addresses is calculated by entering the origin and destination information into the Postage Price Calculator located in usps.com. | No | No | | . | | Periodicals | The USPS does NOT guarantee delivery of Periodicals within a specified time. | No | No | | . | | Standard Mail | Estimated Time of Delivery: 2 to 9 days
(The USPS does NOT guarantee delivery of Standard Mail.) | No | No | | | Note: Typically military mail letters are delivered between seven and 10 days depending on country of destination. Priority Mail parcels will take 10 to 15 days. Parcel Post takes about 24 days, according to MPSA (Military Postal Service Agency) officials.
Transit times will vary depending on operational conditions and the unit of the addressee. Those in established bases should continue to receive regular service, while those in forward areas or engaged in operations may experience longer arrival times due to logistical constraints. During Desert Storm we equated this with the military postal system having to forward mail to a population rivaling that of the city of Richmond, VA that was moving through an area the size of the U.S. east of the Mississippi river.
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