how many days for flat rate shipping

how many days for flat rate shipping depends on the carrier, with USPS Priority Mail Flat Rate typically delivering within 1 to 3 business days domestically. This shipping option is popular due to its predictable pricing and wide availability of flat rate boxes. The exact delivery time may vary based on origin and destination zip codes, holidays, or weather disruptions. Still, it remains a go-to choice for businesses seeking speed without the complexity of weighing packages or calculating zone-based pricing.