July 2024 Postage Rates For Large Envelopes. The new rates include a 5. The baseline postage rate to mail a flat/large envelope has increased from $1.39 to $1.50 in postage.

Explore the usps postage rate shifts for postcards, flats, and letter sizes in 2024, and optimize your mailing strategies. The charts below show the old rates (crossed out) and new rates (in yellow) for common types of usps mail.