This is the correct answer. Drop down I-15 to the Price exit on Hwy 6 in Spanish Fork. Take that over to connect into
Hwy 191 to Green River from Price. This will connect you into Hwy 70 and then it’s essentially 70 over to Salina, KS. Turn onto Hwy 135 south and it will connect into Hwy 35 in Wichita. That will take you straight into OKC.