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On Sunday, Jan. 26, the cost to mail a first-class single-piece letter jumped from 46 cents to 49 cents. The U.S. Post Office's 3-cent increase is the largest hike for consumer postage in more than a decade. The cost of mailing a postcard will also go up to 34 cents, a 1-cent increase.
Postage Rates. The least expensive priority mail flat rate envelopes are $5.75. These range in size from 5 x 10 up to 12-1/2 x 9-1/2. By comparison, sending a 12-1/2 x 9-1/2 priority envelope that weighs five pounds would cost $21.55 instead of the flat rate of $5.75. When mailing items over 13 ounces, flat rate options will save you money over the cost of first class mail.