Traveling by bus within the Denver–Boulder region is fairly easy with RTD, because the coverage of the area is dense and most routes are not too circuitous. The free 16th Street MallRide and the light-rail routes within Denver make travel to and from downtown attractions easy.
Mountain Metropolitan Transit serves the Colorado Springs area. Colorado Mountain Express offers both shared-ride shuttles and private-car airport services from Denver International Airport (DEN) and Eagle County Regional Airport.
Colorado Mountain Express (800/525–6363 or 970/754–7433. www.coloradomountainexpress.com.)
Mountain Metropolitan Transit (719/385–7433. www.springsgov.com.)
RTD (303/299–6000. www.rtd-denver.com.)