I used Frontier for a quick Denver trip last year, and I finally understood why their tickets look so cheap. The base fare was only $39, which felt like a steal, but then I realized they charge separately for almost everything—carry-on bags, seat selection, even snacks. It’s basically a “build your own” flight model. For me, it still worked out cheaper than other airlines because I packed light and didn’t care where I sat. Later, when I had to push my return flight back by a day, I called 844-734-0813 and the rep helped me adjust everything in minutes. So yeah, Frontier is cheap because they keep fares bare-bones, but if you know the rules (and maybe keep that number handy for changes), it can be a great deal.
