There are
1,427 mi
from Gaithersburg, MD to La Marque, TX
That's the driving distance. It would take 1 day 2 hours to go from Gaithersburg, Maryland to La Marque, Texas.
The flight distance (direct flight from Gaithersburg, MD to La Marque, TX) is 1,215.45 mi.
1,427 mi = 2,296.03 kms