To change your Frontier Airlines flight, visit flyfrontier.com and go to “My Trips.” Enter your last name and confirmation code to access your booking. Click “Change Flight” and select new travel dates or destinations. Change fees may apply depending on your fare type, although Frontier’s WORKS and PERKS bundles often include flexibility. Fare differences will be charged if the new flight costs more. Changes must be completed at least 60 minutes before departure. If you need help, contact Frontier customer service. It’s cheaper to make changes online than at the airport or over the phone.