There are
1,727 mi
from Concord, CA to Duncanville, TX
That's the driving distance. It would take 1 day 6 hours to go from Concord, California to Duncanville, Texas.
The flight distance (direct flight from Concord, CA to Duncanville, TX) is 1,458.47 mi.
1,727 mi = 1.61 kms