There are
1,685 mi
from Thornton, CO to Summerville, SC
That's the driving distance. It would take 1 day 6 hours to go from Thornton, Colorado to Summerville, South Carolina.
The flight distance (direct flight from Thornton, CO to Summerville, SC) is 1,451.53 mi.
1,685 mi = 1.61 kms