For international customers, if you wish to order with regular mail shipping and have Christmas delivery you must select UPS Expedited or UPS Express/Saver shipping during checkout to ensure delivery by December 24th, you have until probably the 18th if you choose one of those methods. Customs clearance issues aside, UPS express is 2 business days to most areas of the globe. Canadian customers would be the exception, you could still use UPS standard up to probably the 17th before you had to go to an air option. For domestic customers, regular ground shipping should be fine also up until the 18th, after that you should consider upgrading to 3 day, 2 day, or Next Day Air.
