Send a letter from the United States to Canada using the First-Class Mail International option provided by U.S. Postal Service. The cost of sending a letter to Canada is slightly more than sending it within the United States.Continue Reading
Address the letter to a destination in Canada. Include the appropriate postal code after the city, and write "Canada" on a separate line at the bottom of the address.
Place the letter on a postage scale. As of February 2015, only letters or flat envelopes weighing less than 4 pounds can be sent via First-Class Mail International.
Include enough postage to mail the letter to Canada. It is acceptable to use regular or international postage stamps or metered mail.
Take the letter to a local post office, or drop it into a blue U.S. Postal Service mailbox.