Frontier Airlines has a very specific boarding process aimed at maintaining tight schedules and ensuring timely departures. Boarding begins approximately 30–40 minutes before departure and closes 15 minutes prior to takeoff. Here’s how it works: Passengers are assigned boarding zones based on ticket type and add-ons (like priority boarding). The airline boards by zone to main... https://airportsterminalhub.com/airlines/frontier-airlines/frontier-airlines-denver-international-airport-den-terminal/