St. Louis Lambert Airport (STL) : I-70 west to I -270 south to I-44 west to Six Flags Rd exit (261). Right at Stop light. Straight through second stop light. Left turn into parking lot.
Spirit of St. Louis Airport (SUS) : North on Spirit of St. Louis Blvd. Left (west) on Chesterfield Airport Rd. Left (south) on West Olive Street Road. Continue south and road will turn into North Eatherton Road. Continue to Highway 109. Stay on 109 then take Interstate 44 west to exit 261.