#USPS holiday mailing dates
USPS recommends mailing to Mainland by Dec. 18 for Christmas delivery
The United States Postal Service suggests Hawai‘i residents mail their Christmas letters, cards and packages by Wednesday, Dec. 18 for First-Class and Priority mail headed to the Mainland US. Procrastinators have until Friday, Dec. 20 to send their holiday cheer to the Mainland US via USPS expedited Priority Express shipping service. USPS notes that these dates apply to mail received by each Post Office’s cutoff time.