You can use the price of your ticket for a new reservation within 13 months after the cancellation. When ordering a new flight you will have to pay any additional difference in the ticket price. Before cancellation must go through Spirit Airlines Cancellation Policy.

Step to cancel a Spirit Airlines flight online

• Go to the Spirit Airlines official website - launch the web browser
• Click on the "My Direction" tab, which will appear at the bottom, where it will ask you to enter a six-digit booking reference with the guide\'s last name.
• Provide relevant details as they match your Spirit Airlines flight booking details.
• This will take you to the next page where it will give you details about your current or previous route.
• Click on the "cancel my booking" tab.
• If your flight is entitled to a refund, it will provide you with the details accordingly before canceling.
• Upon initiating the cancellation, a confirmation email will be sent automatically to your email address at the time of booking.
• Spirit Airlines cancellation policy always works for the convenience of passengers. If you cancel Spirit Airlines according to their terms and conditions, you can request a full refund of your booked Spirit flight.

Source: Spirit Cancellation