usps priority mailing envelope cost

usps priority mailing envelope cost USPS Priority Mail envelopes are available at a flat rate, and the cost for a Priority Mail envelope depends on the size of the envelope and whether it’s for domestic or international delivery. For example, the cost of a small flat-rate envelope starts at around $9.65 for domestic deliveries. Larger envelopes may cost more, depending on the weight and destination. These envelopes come with tracking and delivery updates.