Frontier allows travelers to change their flight dates but fees may apply. You can make one free date change if it is done at least 14 days before departure. After that, a fee is charged depending on the route and type of ticket . The amount depends on when you request the change. It is best to log into your Frontier account online or call their customer service line as early as possible to Frontier Airlines Date Change. For further information contact at helpline 1 (855) 981-4544 or 1 (844) 902-4930 (OTA-Skip Waiting). Or go to the Airlinespetpolicy site.