Cheapest way from downtown Milwaukee to MKE?

I’m an MSOE Student, and I know I can get from the hop to the intermodal station to take the Hiawatha to the airport, but that’s a lot of time, and I’m not sure price wise. Am I better off just getting an Uber? Or is there a better option I’m not considering. I’m looking for the easiest solution with the least time consuming travel.