The are 4 different ways across 3 unique modes of transportation to help you travel from Aurora to Amarillo. The fastest way out of Denver towards Amarillo is by bus, as it is the quickest to the Amarillo area. This doesn't necessarily take into consideration traffic or weather - so these may impact some of your decision making. It's common to find tickets for as low as $73. Southwest Airlines operates from Aurora to Amarillo, so you book your trip with them! Book as soon as you can, as there may be limited availability.
On your trip from Aurora to Amarillo, it is best to book as soon as possible. It won't necessarily help reduce your price by a large amount, but will ensure that you have a spot on the bus or train.