There are
1,628 mi
from Gaithersburg, MD to Robstown, TX
That's the driving distance. It would take 1 day 6 hours to go from Gaithersburg, Maryland to Robstown, Texas.
The flight distance (direct flight from Gaithersburg, MD to Robstown, TX) is 1,411.36 mi.
1,628 mi = 2,619.96 kms