Customers can change their flight bookings within 24 hours of booking them with Spirit Airlines.
https://www.flyspirito.com/how-do-i-change-my-flight-with-spirit.php
https://www.flyspirito.com/spirit-airlines-customer-services.php
https://www.flyspirito.com/how-do-i-change-my-flight-with-spirit.php
https://www.flyspirito.com/spirit-airlines-customer-services.php