Priority Mail Express

Priority Mail Express Shipping Boxes.

Overnight Guarantee1

Our fastest domestic service, with limited exceptions, available 365 days a year, with a money-back guarantee1 and overnight scheduled delivery to most U.S. addresses, including PO Boxes2. Plus, discounts off retail prices may be available when you purchase the service online.

Flat Rate Pricing3

No weighing or calculating needed up to 70 lbs. Flat Rate offers one rate to any state.

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  • Free Package Pickup4 service at your home or office
  • Price includes proof of delivery signature record (if requested at time of purchase), and tracking information with USPS Tracking®
  • Includes up to $100 of insurance5 with most shipments6
  • Overnight scheduled delivery by 10:30 am, or on a Sunday or holiday available in many major markets for an additional fee

See Insurance and Extra Services Details


Except for Priority Mail Express Flat Rate pieces, Priority Mail Express® prices are based on weight and zone. Calculate expected domestic shipping costs for domestic shipments using the Price Calculators.

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Additional Pricing Information

See Pricing Files
Calculate Volume Prices

Type Dimensions Great for... Free Supplies7
Envelope 12 1/2" x 9 1/2" Documents
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Legal Envelope 15" x 9 1/2" Legal Documents Order Now
Padded Envelope 12 1/2" x 9 1/2" Clothing
Boxed Jewelry
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11 1/4" x 8 3/4" x 6"

11" x 8 1/2" x 5 1/2"

Office Supplies
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14" x 12" x 3 1/2"

13 5/8" x 11 7/8" x 3 3/8"

Puzzle Boxes
Small Merchandise

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For Businesses

USPS Corporate Account

Streamline your payments by charging all of your Priority Mail Express shipments to one account. And for easy record-keeping, you'll get a monthly report with an itemized list of shipments.

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Priority Mail Express Open & Distribute

Expedite the transportation of your bulk mailings with Priority Mail Express Open & Distribute. We use regular Priority Mail Express distance-based prices to quickly move your mailings at a reasonable cost. And with a special bar-coded label, you can track your shipment.

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Manage Incoming Mail

Our cost-effective and convenient mail services help you keep up with your incoming mail, and manage your outgoing mail, so you can better focus on growing your business.

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Overnight Deliveries

Drop off times vary by Post Office but it’s easy to find convenient locations when you know the ZIP Codes you’re shipping to.

Find a Location


Maximum weight is 70 lbs.

Maximum combined length and girth (girth is the distance around the thickest part of the mailpiece) is 108 inches.

When sealing a Flat Rate Envelope or Box, the container flaps must be able to close within the normal folds.

About Preparing Your Shipment

There are specific regulations and standards for mailing restricted, prohibited, and hazardous materials, including cigarettes and smokeless tobacco.

See All Restrictions

Packages shipped to a Military Post Office (APO/FPO/DPO) pay domestic prices, but require a customs form and have specific restrictions.

Shipping to an APO/FPO/DPO

Request a Refund

If your shipment didn't arrive on the guaranteed delivery date, submit a refund request for failure of service within 30 days of the mailing date.

Get Priority Mail Express Refund Information