us mail time estimator
Here are the estimated delivery times for the US Postal Service: 1  Domestic Priority Mail - usually 2-3 days estimated. 2  Domestic 1st Class Mail - usually 1-3 days estimated. 3  Domestic Parcel Post - usually 2-9 days estimated.  Military First Class Mail - 7-10 days (estimate by MPSA - Military Postal Service Agency)