Frontier Airlines review: Flight changed without notification

I booked a round trip in July for an upcoming trip. I was notified in August that my return flight had a change and my flight home would be a couple hours later. Not a big problem since they gave me plenty of advance notice. I happened to check my status to let my son know the time to be picked up and saw that they changed that flight time as well, but without informing me at all. I contacted their agent and was told I could change flights. I have a cruise that I am supposed to join with other family members so I have no choice but to deal with it. I used Frontier before and thought them good, but now I don't think so. The airport here and at my destination are at least an hour or two away, and my ride was already planned, and now I have to reschedule everything. If I hadn't happened to check on my own I would not even have known about the flight change until almost the last minute.