There are
1,523 mi
from Rosenberg, TX to Downey, CA
That's the driving distance. It would take 1 day 2 hours to go from Rosenberg, Texas to Downey, California.
The flight distance (direct flight from Rosenberg, TX to Downey, CA) is 1,343.23 mi.
1,523 mi = 2,450.56 kms