If you want your Christmas cards and presents to reach their destination before Santa does, the major shipping carriers have some important dates for you to jot down. For the United States Postal Service, you have until December 17th to send most domestic items to ensure they arrive on time, though Priority Mail (December 18th) and Priority Mail Express (December 20th) can buy you extra time if you are willing to pay more. If your cards and gifts are traveling overseas, the window for international and military mail runs from December 2nd through December 9th.

For UPS, December 19th is the key date for 3 Day Select, though 2nd Day Air (December 22nd) and Next Day Air (December 23rd) can also get packages delivered in time. With FedEx, you’ll need to send packages by December 15th to use Ground Economy services; otherwise, you’ll have to rely on faster, more expensive options, including December 20th (FedEx Express Saver), December 22nd (FedEx 2Day), and December 23rd (FedEx Overnight).

You can contact any of the three carriers for additional shipping options. According to logistics technology provider ShipMatrix, approximately 2.3 billion packages are expected to be handled by U.S. delivery services this holiday season, about five percent more than last year.