You have two options to make changes: via phone or at the airport. To access Frontier Airlines Flight Change Policyservice through the phone, dial +1-800-315-2771 (OTA-Skip Waiting). If you're wondering How To Change Frontier Airlines Flights, rest assured that the airline offers two alternatives to address this query. Frontier Airlines offers both online and offline avenues for adjusting and managing your reservations. Travelers can choose either method according to their personal convenience.