Price of U.S. Postage Stamp Going Down 2 Cents - Wall Street Journal A temporary rate increase granted to the U.S. Postal Service in January 2014 by its regulators to help offset the lingering effects of the most recent recession is ending. As a result, starting on April 10 a stamp for a 1-ounce letter will cost 47 cents, down from 49 cents. International letters will go down by 5 cents to $1.15, and postcards will be 1 cent cheaper, at 34 cents. The Postal Service fought the change, and said Thursday it adds up to about $2 billion in much-needed revenue annually.