How to Change Your Frontier Flight Changing your Frontier flight is easy. Log in to your Frontier account and go to the “My Trips” section. Select the flight you want to change and click “Change Flight.” Choose your new flight from the available options, review any fees or fare differences, and confirm the change. If you encounter issues, you can contact Frontier Airlines customer service for assistance. Always check Frontier's change policy, as fees vary based on the fare type and how far in advance you make the change.