You can manage your Frontier Airlines booking on their website or mobile app. Here you can change your flight, choose your seat, add bags, and more. You'll need your confirmation code to access your reservation. For additional help about Frontier Airlines Manage Booking, call their customer service line at 1 (855) 981-4544 or 1 (888) 838-0309 (OTA-Skip Waiting) or visit the Airways Manage Booking website.