what is cheapest way to ship packages depends on several factors, including package size, weight, and destination. For smaller and lighter packages, USPS First-Class Mail is often the most affordable option. For larger or heavier packages, USPS Priority Mail, UPS Ground, and FedEx Ground may offer competitive rates, especially for domestic shipping. International shipping rates can vary greatly, and it’s important to compare prices between carriers like USPS, UPS, and FedEx for the best deal. Additionally, using flat-rate shipping boxes, offered by USPS, can help save money for heavier items. To find the cheapest way to ship packages, it’s essential to evaluate the shipping needs and use tools such as online calculators provided by the carriers.