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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.
How much does it cost to mail a letter to Peru from the US? According to the Postage Price Calculator http://ircalc.usps.gov/MailServices.aspx?country=10354&m=1&p=0&o=1 it costs $0.98 cents to mail a 1oz. letter from the U.S. to Peru â¦ .f the letter is an ounce or less, and it is a standard size, then  the cost is a first class stamp (currently $0.44).    Because Puerto Rico is essentially part of th â¦ e US.