I'm flying to Texas in 8 days and bought a two-way ticket with Frontier Airlines a month or two ago. (Both ways have a layover in Denver, Colorado.) I now decided that I want to drive back, so I want to find a way to cancel just the return flight of my reservation. The return flight is $153 so it will still be worth it if I have to pay the $119 cancellation fee... Should I even bother cancelling beforehand, or should I just not show up?