There are
1,544 mi
from Gaithersburg, MD to Port Lavaca, TX
That's the driving distance. It would take 1 day 4 hours to go from Gaithersburg, Maryland to Port Lavaca, Texas.
The flight distance (direct flight from Gaithersburg, MD to Port Lavaca, TX) is 1,326.18 mi.
1,544 mi = 2,484.43 kms