USPS Priority Mail Express

When speed matters most, USPS Priority Mail Express® offers the fastest domestic delivery from the Postal Service. The service provides guaranteed overnight to 2-day delivery to most U.S. addresses, including P.O. Boxes and military bases. Through Shippo, you can access discounted USPS Priority Mail Express rates, making it easier to ship urgent items—like important documents or high-value products—without paying full retail prices and keeping your customers satisfied.

What is the USPS Priority Mail Express Service Level?

USPS Priority Mail Express is an expedited shipping service, offering overnight or 2-day delivery for packages weighing up to 70 pounds (with a max combined length and girth of 108 inches). Overnight deliveries can typically be counted on to arrive by 10:30 am the next day, and Sunday and holiday delivery options are available in many larger cities (though generally these do come with an extra fee).

Because of its quick shipping times, this service does tend to cost more than other USPS Priority Mail services.

Shippo’s discounted rates for USPS Priority Mail Express start at:

  • $22.75 for a Flat Rate Envelope
  • $22.95 for a Legal Flat Rate Envelope
  • $23.25 for a Padded Flat Rate Envelope

Shippo’s discounted rates for USPS Weight-Based start at $22.75.

In terms of packaging, you have two options:

  • If your package fits into one of the three Flat Rate Envelopes mentioned above, you can get Flat Rate packaging at a Post Office or online for free.

However, you aren’t required to use USPS packaging materials when shipping via Priority Mail Express:

  • If your shipment doesn’t fit in one of the above mentioned Flat Rate Envelopes, you are able to use your own packaging. This is also a great option if you prefer to incorporate custom branding into your boxes or envelopes.

The Key Benefits of USPS Priority Mail Express

Generally speaking, the main reason you’d want to use this service over other Priority Mail solutions is, well, its speed!

But beyond expedited delivery, there are several other reasons why Priority Mail Express has become such a popular choice for e-commerce business owners:

  • It comes with a money-back guarantee
  • Free pickup is available from your home or business
  • The rates include USPS tracking
  • It comes with $100 worth of insurance for most packages
  • A proof of delivery signature record can be included (as long as you request one when purchasing the service)

Who Should Use USPS Priority Mail Express?

USPS Priority Mail Express is a good choice if you’re shipping packages that need to reach their destination within two days, max. For example, it’s a great option for e-commerce merchants who offer expedited shipping at checkout.

If shipping speed isn’t as crucial for your business, however, you might want to consider other USPS Priority Mail service levels that tend to be cheaper. Pricing for shipping a small, Priority Mail Flat Rate box, for example, starts at just $7.90 with Shippo’s discounted rates.

Risk-Free Speed with a Money-Back Guarantee

One of the biggest advantages of USPS Priority Mail Express® is its money-back delivery guarantee. If a package doesn’t arrive by the promised delivery date and time, you may be eligible for a refund of the postage. This makes it a reliable option for time-sensitive shipments where delays could impact your business or customers.

USPS Priority Mail Express labels also include up to $100 of insurance and free tracking. With Shippo, you can easily add services like proof-of-delivery signatures or schedule a free carrier pickup from your home or warehouse. Shippo’s dashboard also lets you compare USPS Priority Mail Express rates with other shipping options instantly, helping you decide when faster delivery is worth the cost.

Instantly Estimate Your USPS Shipping Costs

If you don’t have a ton of extra time to spend crunching all the numbers yourself, Shippo makes it incredibly easy to get visibility into up-to-the-minute Priority Mail Express pricing with our USPS Shipping Calculator.

You simply need to enter your shipping location, package destination, and package type, dimensions, and weight. From there, the calculator will work its magic to let you know exactly how much you can expect to pay by shipping via different service levels.

Always Access the Lowest Prices with Shippo

If you’re looking for the most cost-effective shipping options, with prices up to 90 percent off, Shippo can help. Because we partner with more than 50 worldwide carriers — USPS included — we’re able to pass on lower rates to our customers than they’d be able to negotiate on their own.

And that’s just our pricing advantages.

Shippo’s label creation automation options let you set up business rules to print labels faster, saving you time and money by syncing orders and tracking information. Shippo also lets you validate addresses to prevent failed deliveries, in addition to generating labels from existing order files so that you don’t have to input data manually.

You can also take advantage of robust tracking features that let you share up-to-date package status info with your customers, and customize your shipping notifications to provide a smooth, streamlined customer experience that highlights your branding.

When it comes to returns, Shippo includes critical automation features — for free. Give your customers the ability to easily print return labels to make sending back items a breeze.

You can also take advantage of Shippo’s comprehensive analytics and reporting tools. Track your total shipping spend, per-package costs, the number of labels you’ve created, your shipping history, and more to make smart, efficient shipping decisions as you grow and scale your business.

Sign up for free and see why more than 100,000 brands trust Shippo to support their e-commerce businesses.

Looking for a multi-carrier shipping platform?

With Shippo, shipping is as easy as it should be.


  • Pre-built integrations into shopping carts like Magento, Shopify, Amazon, eBay, and others.
  • Support for dozens of carriers including USPS, FedEx, UPS, and DHL.
  • Speed through your shipping with automations, bulk label purchase, and more.
  • Shipping Insurance: Insure your packages at an affordable cost.
  • Shipping API for building your own shipping solution.
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