Book flights & check-in with the Frontier app to save time and money! Travel is easier than ever before with the Frontier Airlines mobile app: • Book your next trip, search flights, and explore our route map and destinations. • View and manage upcoming trips. • Upgrade your seat to UpFront Plus, Premium, or Preferred, or select a standard seat. • Add a carry-on bag, checked bag, bundle, priority boarding, or other options. • Check flight status, including departure time, arrival time, and gate information. • Save time at the airport with fast checked bag drop or by going straight to the gate without checked bags. • Join Frontier Miles to earn travel miles and elite status points. • Use your Frontier Miles to book award travel. • Join Discount Den and get our lowest fares and exclusive savings and offers, including Kids Fly Free (restrictions apply).