There are
1,898 mi
from Katy, TX to Vallejo, CA
That's the driving distance. It would take 1 day 8 hours to go from Katy, Texas to Vallejo, California.
The flight distance (direct flight from Katy, TX to Vallejo, CA) is 1,613.49 mi.
1,898 mi = 3,054.78 kms