There are
1,409 mi
from Lewisville, TX to Downey, CA
That's the driving distance. It would take 1 day to go from Lewisville, Texas to Downey, California.
The flight distance (direct flight from Lewisville, TX to Downey, CA) is 1,217.44 mi.
1,409 mi = 2,267.54 kms