There are
1,751 mi
from Gaithersburg, MD to San Benito, TX
That's the driving distance. It would take 1 day 8 hours to go from Gaithersburg, Maryland to San Benito, Texas.
The flight distance (direct flight from Gaithersburg, MD to San Benito, TX) is 1,484.27 mi.
1,751 mi = 2,818.50 kms