Spirit Canceling Flights

I booked a trip with Spirit going from FLL-CTG in February. When I first looked at the schedule they had trips daily, and I was planning to book on Saturday and arranged my Hotel room. When I went to book the flight, the Saturday flight had been cancelled, so I booked for Friday 4/17. On 4/6 I was checking on things, and noticed that my Flight to CTG wasn't there. I contacted the Spirit and they said the flight was cancelled and just gave me an option for credit or refund. I ended up booking on Jetblue to get down to CTG on Friday but what time frame will Spirit cancel a flight? I'm worried about being out of country and not being able to get back because of another cancelation.