If you're shipping to military addresses, the deadline for most addresses is Dec. 10 for First-Class Mail and Dec. 17 for Express Mail.
For international mail, the deadline to mail to most countries is either Dec. 2 or 9 for First-Class and Dec. 15 for Express.
You have until Dec. 20 to mail packages here in the U.S., or for last-minute shoppers, you have until Dec. 22 for Express Mail.
For the deadlines for particular areas or different types of mail, go to www.usps.com/shippingdates.