New First Class Postage Rates 2024. On sunday, the cost of a stamp is going up for the second time this year, jumping 5 cents for first class postage to 73 cents. The new rates include a five.

On sunday, the cost of a stamp is going up for the second time this year, jumping 5 cents for first class postage to 73 cents. How much does it cost to mail a letter in 2024?