USA Express operates a bus from St. Louis Airport (STL) to Rolla every 4 hours. Tickets cost $110 - $130 and the journey takes 2 h. Alternatively, Cape Air flies from St. Louis Airport (STL) to Rolla 4 times a day.
From Lamber-St Louis International Airport bus to Rolla, MO. 2 h $117. From St. Louis Airport (STL) drive to Rolla. 1 h 52 min $12. From St. Louis airport fly to Fort Leonard Wood airport, taxi to Fort Leonard Wood, MO, then bus to Rolla. 2 h 43 min $204.