When you book a Frontier Change Flight, you have the option of making changes. Except for tickets purchased for travel within 7 days, changes are permitted. Otherwise, you can change your flight date for up to 24 hours after purchasing your ticket. To change the flight date, log in to My Trip and go to the Manage my Bookings page. You can change your flight ticket date after more than 24 hours by going to the My Flights section of Manage My Booking.