Sometimes it may be easier to get around downtown by cab since traffic is not too busy right in the mid section and prices not terrible.
IMO one of the best things about Saint Louis. Makes it incredible easy to get around. Even goes to the airport.
from st-louis lambert airport,there is a metrolink very convenient to downtown:3$;to go to the airport from downtown,it costs only 1,25 $
take a pass with metrolink+bus;a day pass costs 4$
Between the Airport, Union Station, Busch Stadium, Downtown and Laclede's Landing as well as points in between, you may use the MetroLink!