There are
1,409 mi
from Downey, CA to Lewisville, TX
That's the driving distance. It would take 1 day to go from Downey, California to Lewisville, Texas.
The flight distance (direct flight from Downey, CA to Lewisville, TX) is 1,217.44 mi.
1,409 mi = 2,267.03 kms