11,462.12 miles (18,446.44 kilometres)
About 450 miles.
It is 521 miles according too Google Maps.
The driving distance between Amarillo, TX and Washington, DC is approximately 1600 miles. The driving time would be approximately 26 hours if you were to travel non-stop in good driving conditions....
There are 380 miles between Washington, DC, and Asheville, NC (as the bird flies).