Priority Mail Express® service provides 1–3 day delivery service by 6 PM with a money–back guarantee. You get competitive prices and fast delivery every day, all year, with limited exceptions, to most U.S. addresses and PO Boxes™. Priority Mail Express Flat Rate lets you ship packages up to 70 lbs to any state at the same price. Mail from Post Office™ locations or online from your home or business. Prices start at $35.65 at a Post Office. (Ship online with Click-N-Ship® and get lower Commercial Rates.)

Priority Mail Express® service provides 1–3 day delivery service by 6 PM with a money–back guarantee. You get competitive prices and fast delivery every day, all year, with limited exceptions, to most U.S. addresses and PO Boxes™. Priority Mail Express Flat Rate lets you ship packages up to 70 lbs to any state at the same price. Mail from Post Office™ locations or online from your home or business. Prices start at $35.65 at a Post Office. (Ship online with Click-N-Ship® and get lower Commercial Rates.) Features & Pricing: - Fastest delivery times: 1–3 days with a money-back guarantee - Sunday and holiday delivery available in many major markets for an additional fee - Free Package Pickup service at your home or office - Includes USPS Tracking® and up to $100 of insurance with most shipments - Price includes proof of delivery signature record (if requested at time of purchase) - USPS Label Delivery service: For an extra $1.65 per label, USPS will print an outbound label and deliver it to you Weight, Size, & Shape Requirements: Maximum weight is 70 lbs for all options. Maximum combined length and girth is 108". Dimensional (DIM) weight rates apply to large, lightweight packages over 1 cubic foot (1,728 cubic inches). Multiply Length x Width x Height and divide by 166 to get the DIM weight in pounds. Nonstandard Fees apply for packages that are harder to process: - Between 22 and 30 inches long: add $4.50 - More than 30 inches long: add $21.00 - More than 2 cubic feet (3,456 cubic inches): add $35.00 - Nonstandard shape or material: add $4.50 Live Animal and Perishable Handling Fee: $7.50 extra handling fee required for live animals or perishable items like food or plants. Refunds: If shipment didn't arrive on guaranteed delivery date or time, submit refund request within 30 days of mailing date. For Businesses: - Priority Mail Express 1 day delivery available for urgent shipments - Commercial Pricing available through Click-N-Ship with discounted rates - Negotiated Service Agreement (NSA) available for larger volume shippers - Priority Mail Express Return option for customer returns - Priority Mail Express Open & Distribute (PMEOD) for bulk mailings Flat Rate Products Available: - Flat Rate Envelope: $31.11 Commercial Pricing / $35.90 at Post Office (12.5" x 9.5") - Legal Flat Rate Envelope: $31.43 Commercial Pricing / $36.20 at Post Office (15" x 9.5") - Padded Flat Rate Envelope: $31.70 Commercial Pricing / $36.90 at Post Office (12.5" x 9.5") Boxes and envelopes are delivered with regular mail usually within 7 to 10 days.