The Miramar-based airline is upgrading its systems, but its website was also down Wednesday morning.
An airline spokeswoman said in an e-mail to The Associated Press that "all flights are operating and we have not had any cancellations."
Fort Lauderdale-Hollywood International Airport spokesman Greg Meyer says Spirit is manually checking in passengers at the airport, and no flights have been delayed.
The security checkpoint at Palm Beach International Airport has not been affected due to the system failure.
(Copyright 2010 by The Associated Press. All Rights Reserved.)