Once you’ve cleared security, you’ll head to the designated Frontier Airlines gates, which are usually located on the east side of Terminal E. Gates can change based on daily schedules, so keep an eye on the flight information displays or check with airport staff for updates.
Boarding typically begins 30–40 minutes before departure, and Frontier uses a zone-based boarding process, ... https://airportsterminalhub.com/airlines/frontier-airlines/frontier-airlines-dallas-fort-worth-international-airport-dfw-terminal/