Frontier Check-In and Baggage Process Check-in with Frontier is designed to be simple and budget-focused. Travelers can check in: Online starting 24 hours before departure Via the mobile app At airport kiosks or the ticket counter on Level 3 (Departures Level) of Terminal A Since Frontier operates on an ultra-low-cost model, your base fare includes only one personal item ... https://airlinestermnals.com/frontier-airlines-mco-terminal-orlando-international-airport/