Usps Large Envelope Rates 2024. For certain services, discounted pricing is available for customers. The prc has approved the usps rate change scheduled to take effect january 21st, 2024.

The baseline postage rate to mail a flat/large envelope has increased from $1.35 to $1.39 in postage, but the price for each additional ounce also stayed the same. See forever postage stamp prices and other postage rates.