There are
1,358 mi
from Gaithersburg, MD to Grapevine, TX
That's the driving distance. It would take 1 day to go from Gaithersburg, Maryland to Grapevine, Texas.
The flight distance (direct flight from Gaithersburg, MD to Grapevine, TX) is 1,187.37 mi.
1,358 mi = 2,186.19 kms