The driving distance between Amarillo, TX and Oklahoma City, OK is approximately 260 miles. The driving time would be approximately 4 hours 30 minutes if you were to travel non-stop in good driving conditions. (The driving time does not take into consideration conditions which may extend trip time such as weather, road work, border crossings and rush hour traffic in urban areas.)
Amarillo is a city in Texas.
My guess is Oklahoma City because Dallas is farther and i think Denver and Albuquerque may even be closer to Amarillo then Dallas is.
Amarillo
It is 259.52 according to MapQuest.
It is 250 miles.
around 500 miles
Call it a 4 hour drive and about 260 miles on I-40.
It is 203.78 miles according to MapQuest.
209 miles
340 miles
205 miles
It is 201.76 miles according to MaoQuest.