What is Priority Mail Express?

USPS Priority Mail Express is USPS's fastest service. It delivers overnight to most of the country and in 1 to 2 days everywhere else, including Sundays and holidays. USPS backs it with a money-back guarantee: miss the committed delivery time and they refund the postage, with some exceptions.

What you get

Every Priority Mail Express shipment includes tracking and insurance at no extra charge and delivers to any address in the US. USPS is also the only carrier allowed to deliver an overnight package to a P.O. Box, which UPS and FedEx can't do. Packages up to 70 lbs qualify.

How pricing works

USPS prices Priority Mail Express by zone. There are nine zones, and the rate is based on the distance from where the package ships to where it lands. Delivery on a Sunday or holiday costs extra.

When to use it

Reach for Priority Mail Express when the delivery date is the whole point: time-critical documents, last-minute orders, or anything where a guaranteed window is worth the premium over standard Priority Mail.