Priority Express, officially USPS Priority Mail Express, is the Postal Service’s fastest domestic shipping service, delivering in 1 to 3 days by 6 p.m. with a money-back guarantee. It includes USPS Tracking and up to $100 of insurance on most shipments, accepts packages up to 70 pounds, and delivers every day of the year to most US addresses and PO Boxes, with limited exceptions.
This guide explains how Priority Express works, how the guarantee and delivery days work, how it differs from Priority Mail and Ground Advantage, and when it’s worth using. To see what a Priority Express label costs for your package, compare live USPS and UPS rates in the ParcelPath rate calculator.
What does USPS Priority Express include?
Every Priority Mail Express shipment comes with a set of features that cheaper USPS services don’t bundle. According to USPS, they include:
- 1 to 3 day delivery by 6 p.m. The scheduled date depends on the origin, destination and the time you drop the package off.
- A money-back guarantee. If the package misses its scheduled date, you can request a postage refund, with some exceptions.
- Up to $100 of insurance on most shipments, with extra coverage available to buy for items worth more.
- USPS Tracking and free Package Pickup from your home or office.
- Delivery every day of the year to most addresses, including PO Boxes, with Sunday and holiday delivery available in many major markets for an extra fee.
USPS prices Priority Express by weight and zone, or with a flat rate envelope. Packages larger than one cubic foot are priced on dimensional weight, which USPS calculates by multiplying length, width and height and dividing by 139.
What are the Priority Express size, weight and packaging options?
Priority Express packages can weigh up to 70 pounds and measure up to 108 inches in combined length and girth (girth is the distance around the thickest part). You can use your own box or one of three USPS flat rate envelopes, which ship for one price to anywhere in the US regardless of weight:
| Envelope | Size | Best for |
|---|---|---|
| Flat Rate Envelope | 12½” x 9½” | Passports, documents, manuscripts |
| Legal Flat Rate Envelope | 15″ x 9½” | Legal-size documents and contracts |
| Padded Flat Rate Envelope | 12½” x 9½” | Clothing, books and boxed jewelry |
The envelopes are free from USPS. Priority Mail adds flat rate boxes as well, which our USPS flat rate boxes guide covers. You can also print Express labels yourself with USPS Click-N-Ship or a discounted label service.
How is Priority Express different from Priority Mail?
The main differences are speed and the guarantee. USPS describes Priority Mail as delivering in 2 to 3 days with an expected delivery date that doesn’t come with a money-back guarantee, while Priority Express is 1 to 3 days with a guarantee. Both include up to $100 of insurance, tracking and free pickup, and both accept 70 pounds and 108 inches.
| Feature | Priority Mail Express | Priority Mail | Ground Advantage |
|---|---|---|---|
| Delivery | 1–3 days by 6 p.m. | 2–3 days | 2–5 days |
| Money-back guarantee | Yes (exceptions apply) | No | No |
| Included insurance | Up to $100 coverage | Up to $100 coverage | Up to $100 coverage |
| Max weight | 70 lb | 70 lb | 70 lb |
| Max length + girth | 108 in | 108 in | 130 in |
| Sunday/holiday delivery | In many markets, extra fee | No | No |
Our guides to USPS Priority Mail and how long Priority Mail takes go deeper on the standard service. USPS Ground Advantage is the economy choice when a 2-to-5-day window is fine, and USPS Media Mail is slower still but limited to books and other educational materials. For an overview of every tier, see our guide to USPS services and shipping options.
When should you use Priority Express?
Priority Express earns its premium when a late delivery would cost more than the extra postage. Typical uses are contracts, legal filings and other documents with a hard deadline, replacement items for an unhappy customer, last-minute gifts, and anything that must arrive on a weekend or holiday. For routine orders where a day or two either way doesn’t matter, Priority Mail or Ground Advantage is the better value, and our guide to the cheapest way to ship a package shows how to pick.
Check the calendar before relying on Express around holidays. Our USPS holiday schedule lists the days regular mail doesn’t run, and our guide to whether USPS delivers on Saturday explains weekend coverage for each service.
How does Priority Express compare with UPS and FedEx overnight services?
UPS Next Day Air and UPS 2nd Day Air are UPS’s guaranteed equivalents, and FedEx sells its own overnight and 2-day services. The private carriers offer more time-of-day options, such as early-morning delivery, while Priority Express reaches PO Boxes and delivers every day of the year to most addresses. Our comparison of the differences between UPS and USPS and our guide to overnight shipping compare the options side by side.
ParcelPath sells USPS labels, including Priority Mail Express, at up to 89% off and UPS labels at up to 85% off, with no subscription, no per-label fee and no minimums. It also offers free USPS pickups, printer-free labels through USPS Label Broker at the Post Office, and Shipsurance coverage for high-value parcels.
How do you get a refund when Priority Express is late?
If a Priority Mail Express package arrives after its scheduled delivery date, you can request a postage refund online through the USPS refunds page with your tracking number and receipt, or at a Post Office. USPS accepts one refund request per tracking number and exceptions apply, so check the conditions on the refunds page. Keep your receipt or label record until the package is delivered.
A USPS proof of delivery record shows exactly when the package arrived, which helps if you need to claim. For lost or damaged items, see our guide to USPS insurance coverage.
Is there an international Priority Express service?
Yes. Priority Mail Express International ships to about 180 countries, with USPS quoting 3 to 5 business days to many major markets. It includes up to $200 of merchandise insurance and up to $100 for document reconstruction, and a money-back guarantee applies only to select destinations. Weight limits are 70 pounds for boxes and 4 pounds for the flat rate envelope, and some countries set lower limits.
Frequently Asked Questions
How fast is USPS Priority Express?
USPS Priority Express, officially Priority Mail Express, delivers in 1 to 3 days by 6 p.m., depending on where the package starts, where it’s going and when you drop it off. It’s the fastest USPS domestic service and the only one with a money-back delivery guarantee.
Does Priority Express deliver on Sundays and holidays?
Yes, in many places. USPS delivers Priority Mail Express every day of the year to most addresses and PO Boxes, with limited exceptions. Sunday and holiday delivery is available in many major markets for an additional fee, so check whether your destination ZIP code qualifies before you ship.
What is the weight limit for Priority Express?
Priority Express accepts packages up to 70 pounds and up to 108 inches in combined length and girth. The flat rate envelopes ship for one price anywhere in the US regardless of weight. Packages larger than one cubic foot are priced on dimensional weight rather than actual weight.
Does Priority Express include insurance?
Yes. Most Priority Mail Express shipments include up to $100 of insurance against loss or damage, and you can buy additional coverage for items worth more. The package needs an applicable USPS label for the insurance to apply. Priority Mail and Ground Advantage also include up to $100 of coverage.
Is Priority Express the same as Priority Mail?
No. Priority Mail is USPS’s standard 2-to-3-day service with an expected delivery date and no guarantee. Priority Express is faster, at 1 to 3 days by 6 p.m., comes with a money-back guarantee, and can deliver on Sundays and holidays in many markets for an extra fee.
Sources
- USPS: Priority Mail Express
- USPS: Priority Mail
- USPS: Ground Advantage
- USPS: Priority Mail Express International
- USPS: Request a Domestic Refund
Part of our USPS Services guide. Related: Ground Advantage, USPS Priority Mail, Priority Mail Express.
