<p>Super Shuttle probably is the least expensive way to get to the airport. The airport can be a 45-minute drive from DU. It’s definitely not free; Super Shuttle is a private, nationwide company.</p>
<p>You can also pay more and get a private car through Super Shuttle.</p>
<p>The light rail train system doesn’t yet go all the way to the airport, but it’s being expanded and eventually will.</p>
<p>I don’t know what a regular taxicab ride would cost.</p>