There are
1,551 mi
from Rockville, MD to Amarillo, TX
That's the driving distance. It would take 1 day 4 hours to go from Rockville, Maryland to Amarillo, Texas.
The flight distance (direct flight from Rockville, MD to Amarillo, TX) is 1,380.46 mi.
1,551 mi = 2,496.52 kms