Spirit Airlines check-in is an essential part of preparing for your flight. Whether you're checking in online or at the airport, understanding the process ensures a smoother experience. Online check-in is available 24 hours before departure, allowing you to select seats, add baggage, and print your boarding pass ahead of time. At the airport, Spirit Airlines check-in kiosks or counters can assist you with your travel needs. Be sure to have all required documents and arrive with enough time to spare for any additional procedures or security checks.