There are
1,481 mi
from Amarillo, TX to St Marys, PA
That's the driving distance. It would take 1 day 3 hours to go from Amarillo, Texas to St Marys, Pennsylvania.
The flight distance (direct flight from Amarillo, TX to St Marys, PA) is 1,328.40 mi.
1,481 mi = 1.61 kms