Priority Mail Express is the fastest USPS service, even offering overnight delivery. Guaranteed delivery in 1-3 days.
This is a domestic service. Domestic mail is transported:
within, across, and between the United States.
from the United States to
U.S. territories, Marshall Islands, Federal States of Micronesia.
U.S. military and diplomatic posts, and the United Nations, NY.
Priority Mail Express rates are based on parcel weight, dimensions or packaging, distance, and rate class.
When a custom package is used, parcel weight and dimensions are used to determine postage costs. Costs increase as weight and dimensions increase
Postage costs also increase as the distance increases. USPS uses Zones to measure the distance a domestic shipment must travel, ranging from Zone 1 (local) to Zone 9 (very far away).
Flat Rate services require specially marked envelopes that receive one rate, regardless of distance or weight. If items fit, Flat Rate envelopes are often the lowest cost option. USPS provides packaging at no cost.
Retail pricing is offered directly from the USPS at Post Office retail locations or USPS.com. It does not include discounts on postage prices like those received via ShipWorks.
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