In slc your 30-45 minutes from 7 different resorts i.e. ALTA, BIRD, BRIGHTON, SOLITUDE, CANYONS, PC, DEER VALLEY. Meaning you fly into SLC airport, get your bags and can ski the same day. Fly into denver and your 2+ hours away from the resorts. Furthermore, slc airport runs deals with all the resorts that if you bring your airline ticket to the the mtn on the same day, you ski for free. not sure if CO does that?