Would be cheaper to fly into Dallas and then rent a car and drive down, once you are out of Dallas, its 3 lane interstate the entire way. Not much to see in Waco, think Ottumwa but bigger, lot of people like to check out the Chip and Joann stuff, which is OK.
Find an Airbnb in Dallas and drive down to the game.
After doing a quick search on expedia flights out of Des Moines to either Dallas or Austin, leaving on Friday and flying back on Sunday, I would drive it. Nothing cheap at either airport.