For expected delivery of holiday mail and packages by Christmas, the Postal Service recommends keeping the following mailing and shipping deadlines in mind:
· Dec. 2 – First-Class Mail International/Priority Mail International
· Dec. 10 – Priority Mail Express International
· Dec. 15 – Standard Post
· Dec. 17 – Global Express Guaranteed
· Dec. 20 – First-Class Mail/Priority Mail (domestic)
· Dec. 23 – Priority Mail Express (domestic)
https://www.ithaca.edu/intercom/article.php/20141202122727880