which is cheaper to send packages usps or ups depends on the size, weight, and destination of the package. USPS is generally more cost-effective for smaller, lighter packages, especially for domestic shipping, as it offers options like First-Class Mail and Priority Mail. UPS, on the other hand, is often more affordable for heavier or larger packages, particularly when using its Ground service for domestic deliveries. For international shipments, both carriers offer competitive rates, but USPS tends to be cheaper for smaller parcels, while UPS offers more comprehensive tracking and delivery services.