USPS Priority Mail is a fast domestic service through which you can get your packages in 1-3 Business days which includes extra flat rates for shipping. Your packages shipping charges vary based on your package weight & delivery location. You can use USPS Priority Mail Prepaid Forever Plan to get the pricing same as Flat-rate pricing for the user convenience. Click here To Know about the USPS Postal Holidays in 2018.
Visit Official Website : USPS Tracking
What is Priority Mail Tracking?
USPS Priority Mail tracking is service used to track your package in real time that delivers in 1-3 business days through which includes extra flat rates for shipping. You need to enter unique USPS Priority Mail Tracking number. Price Calculation on domestic service shipping costs for domestic packages & shipments using the Price Calculators based on weight & delivery location.