Missing a flight can happen at any time, either due to the airline’s fault or own negligence. The airline makes a policy for those uncertain about missed frontier flights.
A passenger fails to reach the airport on time but informs the airline. Then, they will obtain rebooking on the next available flights.
The airline can ask for a flight change fee if the passenger is rebooked.
According to the policy of
Frontier Missed flight, when the passenger does not reach the airport on time and does not inform the airline, they will not be eligible to ask for a refund.
Depending on your flight charges, the airline can take the penalty for missed flight.