Key dates for deliver this year for the holidays:

Recommended send-by dates for expected delivery before December 25 within the USA

First Class Mail Dec. 18

Priority Mail Dec. 19

Express Mail Dec. 23rd

Outside the USA

First Class Mail Dec. 7

Priority Mail Dec. 7

Express Mail Dec. 14

Keep in mind First Class is the worst method of shipping possible.  Not responsible for anything lost or damaged with this shipping method.  Also this has been a crazy year so don't trust these dates.  Things have been taking way longer than normal this year with shipping.