us post office overnight shipping rates

us post office overnight shipping rates are competitive, especially through USPS Priority Mail Express. Rates depend on weight, dimensions, and delivery zone, with flat-rate envelopes offering a cost-effective solution for documents. Overnight shipping includes tracking and insurance, ideal for urgent deliveries. Comparing rates with FedEx or UPS can help determine the best value. Planning ahead and dropping off before the cut-off time guarantees next-day delivery.