With the holiday season in full swing millions of people will be sending gifts through the mail in the coming weeks. With so many extra packages being sent during the season, carriers like UPS, FedEx and the U.S. Postal Service are suggesting certain deadlines to ensure gifts arrive before Christmas Day.

Depending on which service you use, factors such as destination, weight, and type of shipping can impact which day you need to send your package out. With that in mind, here are some of the most important shipping deadlines before the holiday.

USPS Deadlines

For packages being sent throughout the lower 48 states, the USPS recommends the following deadlines:

Ground Advantage Service -- Dec. 17

First-Class Mail Service -- Dec. 17

Priority Mail Service -- Dec. 18

Priority Mail Exp

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