How much does iot cost to mail a 2 ounce letter in 2018?

In 2018, the cost to mail a 2-ounce letter within the United States using USPS was $0.70. This rate applied to letters weighing between 1 ounce and 2 ounces. The price may vary for international mailing or using different services, but for standard domestic first-class mail, the 2-ounce rate was set at that amount.