What is the Average Cost of a Letter? Average Letter Price

A first class letter is 44 cents for the first ounce, adding 17cents for each additional ounce. Large envelopes start at 88 cents also with an additional 17 cents for each additional ounce. For certified mail there is a $2.80 charge. Express mail letters start at $13.05 but a flat rate preprinted envelope covering any weight and any distance can be purchased for $17.50. Sending a letter Priority Mail is $4.95 but this increases depending on weight and distance.