USPS Class and Speed of Mail

 

Class of Mail Weight Speed Free Forwarding Special Presort
and Return Services Discounts
Express Mail 70 lbs or less 1-2 Days Yes Yes No
Priority Mail 70 lbs or less 1-3 Days Yes Yes No
First-Class Mail – Letters 3.5 oz or less 1-5 Days Yes Yes Yes
First-Class Mail – Flats 13 oz or less 1-5 Days Yes Yes Yes
First-Class Mail – Parcels 13 oz or less 1-5 Days Yes Yes Yes
Standard Mail 70 lbs or less 3-18 Days No Parcels Only Yes
Package Services 70 lbs or less 2-16 Days No Yes Yes