2024 Postage Rates By Weight In Usa. This means certain shipping and mailing costs will increase for specific zip codes. For large envelopes (flats) up to 15.994 oz., postage prices vary based on weight and destination, starting from $3.15.

This means certain shipping and mailing costs will increase for specific zip codes. On january 21 st, 2024, the usps ® will be adjusting rates for both market dominant and competitive products.