To help customers make sure that their loved ones receive their presents by Christmas Day, the USPS releases the mail-by dates for domestic services:
Dec. 15 – Standard Post
Ground service for less-than-urgent deliveries and over-sized packages.
Dec. 19 – First Class Mail
Service for standard-sized, single-piece envelopes and small packages weighing up to 13 ounces with delivery in three business days or less.
Dec. 21 – Priority Mail
Domestic service in one, two or three business days based on where the package starts and where it’s being sent. Includes variety of flat-rate options.
Dec. 23 – Priority Mail Express
Fastest domestic service, with guaranteed overnight scheduled delivery to most locations. Some restrictions and exceptions apply. Priority Mail Express postage refund eligibility is adjusted for shipments mailed Dec. 22-25.
For military and international deliveries, go to usps.com for more information.