If you booked through a third-party site, you may receive more than one confirmation code:
• You’ll likely get both a Frontier confirmation code and one from the travel agency
• When managing your trip or checking in, use the 6-character Frontier confirmation code (e.g., FLY123)
◦ This ensures you get the latest updates and flight information
If you booked on flyfrontier.com or in the Frontier app and entered an email address, you should’ve received a confirmation email shortly after booking. Your confirmation code will be included in that email.