usps ship saturday allows customers to ship packages on Saturdays, making USPS an excellent option for weekend shipping. USPS operates on Saturdays, and customers can drop off packages or send letters at local post offices, which typically remain open for limited hours. Priority Mail and Priority Mail Express shipments can still be delivered on Saturdays, though some services, like First-Class Mail, may not guarantee Saturday delivery. If customers need to ensure weekend delivery, it’s advisable to check service availability with the local post office.