Postage Rates 2024 Flat Envelope

Postage Rates 2024 Flat Envelope. See what the changes will include and download our rate. The baseline postage rate to mail a flat/large envelope has increased from $1.39 to $1.50 in postage.

Ship from post office ™ locations or online from your home or business. Priority mail express flat rate lets you ship packages up to 70 lbs to any state at the same price.