Priority Mail Express Flat Rate

 

With Priority Mail Express Flat Rate™, shipping with the Postal Service™ is even easier, as Flat Rate offers one rate to any state.  Similar to our Priority Mail Express service, our Flat Rate is our fastest service, with limited exceptions, available 365 days a year with a money-back guarantee and provides scheduled overnight delivery1 to most U.S. addresses including PO Boxes™ and military addresses all for one low, Flat Rate. And you’ll save even more when you buy Priority Mail Express Flat Rate postage online.

Image of Priority Mail Express™ Boxes

Features

  • No weighing or calculating needed2
  • Overnight scheduled delivery to most U.S. locations1
  • Free Package Pickup3
  • Money-back guarantee1
  • Price includes proof of delivery signature record (if requested at time of purchase), and tracking information with USPS Tracking™ and up to $100 in insurance coverage4
  • No surcharges for fuel or Saturday, residential, and rural delivery
  • Sunday, holiday, and 10:30 a.m. scheduled delivery service available for a small fee

Downloadable Pricing File
Priority Mail Express - Retail

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Find out when and where to drop off to get overnight delivery ›

1 For many major markets. Average number of days based on origin and destination.
2 For mailable items up to 70 lbs.
3 For details on free Package Pickup, visit usps.com/pickup.
4 Some restrictions apply. Visit usps.com/makingprioritymailbetter for details.

Service/Option

Size

Great for…

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Envelope

12 1/2" x 9 1/2"

Documents
Manuscripts

Order Now for Express Mail Flat Rate Envelope

Legal Envelope

15" x 9 1/2"

Legal Documents

Order Now for Express Mail Flat Rate Legal Envelope

Padded Envelope

12 1/2" x 9 1/2"

Clothing
Books
Boxed Jewelry

Order Now for Express Mail Flat Rate Padded Envelope

Box-Top-loading

Outside:
11 1/4" x 8 3/4" x 6"
Inside:
11" x 8 1/2" x 5 1/2"

Office Supplies
Shoes

Order Now for Express Mail Flat Rate Top-Loading Box

Box-Side-loading

Outside:
14" x 12" x 3 1/2"
Inside:
13 5/8" x 11 7/8" x 3 3/8"

Office Supplies
Shoes

Order Now for Express Mail Flat Rate Side-Loading Box
If It Fits, It Ships®* Order free Priority Mail Express Flat Rate™ Envelopes. Image of Priority Mail Express Flat Rate™ Envelope. *Mailable items up to 70 lbs.Calculate the Weight. Shop for scales. Image of USPS branded postage scale.Ship Online. Print a label with postage. Image of a printer with shipping label and box.