Current Cost Of Postage Stamp 2024 Per Ounce. 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 at 24 cents per. The new price is a 78 percent increase from when.
Extra ounces rise 4 cents. Postal service is raising prices starting on july 14, including the cost of forever postage stamps.