Frontier emphasizes self-service and digital check-in, so be sure to take advantage of the online check-in process, available 24 hours before your flight. If you do need to check in at the airport, head to the East side of Level 6 in the Jeppesen Terminal where Frontier’s counters are located. Self-service kiosks are available to: Print boarding passes Purchase baggage option... https://airportsterminalhub.com/airlines/frontier-airlines/frontier-airlines-den-terminal-denver-international-airport/