There are
1,681 mi
from Amarillo, TX to St Helens, OR
That's the driving distance. It would take 1 day 5 hours to go from Amarillo, Texas to St Helens, Oregon.
The flight distance (direct flight from Amarillo, TX to St Helens, OR) is 1,318.13 mi.
1,681 mi = 1.61 kms