whats the cheapest way to mail a package depends on the size, weight, and destination of the package. For lightweight items, USPS First Class Mail is typically the most affordable option within the United States. However, for heavier packages, UPS Ground or FedEx Ground may provide better rates, especially for larger shipments. International shipping can vary, but options like USPS First Class International or economy services from couriers like DHL or UPS often offer competitive pricing. It’s always a good idea to compare shipping rates across multiple carriers to ensure you’re getting the best deal.