This app was mentioned in 1 comment, with an average of 2.00 upvotes
Have both Uber and lyft on your phone plus the dallas yellow cab app:
I think you can make it by 8 easy. Game should be over by 630ish, hour maybe to get to the airport. If you are precheck, look at what gates at DFW have it so you go super fast. You can also pay to upgrade your ticket (depending on who you are flying with) to get through security faster.