How To Change A Flight On Frontier Airlines?, passengers can visit the airline's official website and access the "Manage Booking" or "My Trips" section. After logging in with their reservation details, they can select the specific flight they wish to change and proceed with modifying their itinerary. Frontier Airlines typically allows flight changes up to 24 hours before departure, subject to fees and fare differences based on the fare type and new flight selection. Passengers should review all terms, conditions, and potential charges associated with the change. For further assistance, they can contact Frontier Airlines' customer service.