There are
1,623 mi
from Rockville, MD to Robstown, TX
That's the driving distance. It would take 1 day 6 hours to go from Rockville, Maryland to Robstown, Texas.
The flight distance (direct flight from Rockville, MD to Robstown, TX) is 1,411.78 mi.
1,623 mi = 2,611.67 kms