There are
1,589 mi
from Rockville, MD to Cibolo, TX
That's the driving distance. It would take 1 day 4 hours to go from Rockville, Maryland to Cibolo, Texas.
The flight distance (direct flight from Rockville, MD to Cibolo, TX) is 1,365.93 mi.
1,589 mi = 2,556.44 kms