There are
864 mi
from Danbury, CT to Hilton Head Island, SC
That's the driving distance. It would take 16 hours 51 mins to go from Danbury, Connecticut to Hilton Head Island, South Carolina.
The flight distance (direct flight from Danbury, CT to Hilton Head Island, SC) is 751.12 mi.
864 mi = 1,390.41 kms