cheapest way to send a parcel to australia can vary depending on the size, weight, and urgency of the shipment. The USPS First-Class Package International Service is usually the most affordable option for lightweight parcels. For heavier packages, USPS Priority Mail International offers reasonable rates with delivery times between 6 to 10 business days. Other carriers like UPS and FedEx also provide international shipping to Australia, but their rates tend to be higher, especially for expedited services. It’s also worth considering consolidation services or freight forwarding if you are shipping large volumes or bulky items, as they can offer significant savings. Ultimately, choosing the cheapest way depends on the weight, size, and delivery time requirements of your package.