There are
1,546 mi
from Gaithersburg, MD to Amarillo, TX
That's the driving distance. It would take 1 day 4 hours to go from Gaithersburg, Maryland to Amarillo, Texas.
The flight distance (direct flight from Gaithersburg, MD to Amarillo, TX) is 1,378.12 mi.
1,546 mi = 2,488.64 kms