There are
1,425 mi
from Thornton, CO to Snellville, GA
That's the driving distance. It would take 1 day 1 hour to go from Thornton, Colorado to Snellville, Georgia.
The flight distance (direct flight from Thornton, CO to Snellville, GA) is 1,226.88 mi.
1,425 mi = 1.61 kms