Have a look at Frontier Airlines Check-in Policy

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Frontier Airlines offers passengers various check-in options to ensure a convenient and efficient process. With the assistance of Airlines Pet Policy, passengers can choose from Frontier Airlines Check-In options such as airport check-in, online check-in, and self-service kiosks. These options allow passengers to easily select seats, provide travel details, and obtain their boarding passes.
To check in with Frontier Airlines, you have multiple methods available.
Online Check-In:
   1. Visit the Frontier Airlines website or use their mobile app.
   2. Locate the "Check-In" option on the homepage or in the app's menu.
   3. Enter your booking details, including your reservation code and last name.
   4. Follow the prompts to select your seats, verify your travel information, and complete the check-in process.
   5. Once done, you can either print your boarding pass or save it electronically on your mobile device.
Airport Check-In:
   1. Arrive at the airport well in advance of your flight, typically recommended 2 to 3 hours before departure.
   2. Locate the Frontier Airlines check-in counters or kiosks at the airport.
   3. Present your travel documents, such as your passport and flight reservation details, to the airline staff or use the self-service kiosks.
   4. Follow the instructions provided by the staff or kiosk to complete the check-in process.
   5. After a successful check-in, you will receive your boarding pass.
If you encounter any issues or have specific questions regarding your Frontier Check-In process, it is recommended to contact Frontier Airlines Customer Service directly for further assistance. Alternatively, you can visit the mentioned link above or refer to Airlines Pet Policy for more information.