Check-in with Frontier Airlines can be done in several ways: online through their website or mobile app, at airport kiosks, or at staffed counters. Online check-in opens 24 hours before the flight and closes 60 minutes prior to departure.

What to Expect:
Self-service kiosks near the entrance of Terminal 5.

Friendly staff available for assistance.

Clear signage guiding you to TSA and your departure gate.

Gates for Frontier flights are typically located on the west side of Terminal 5.

Baggage Policies at Frontier LAX Terminal
One of the most important things to know before flying Frontier is its baggage policy. As a low-cost carrier, Frontier charges separately for everything outside of a basic personal item.

Baggage Allowances:
Personal Item (fits under seat): Free

Carry-On Bag: Additional fee

Checked Luggage: Fees vary by weight and time of booking

Tip: You can save money by adding luggage to your reservation in advance rather than paying at the airport.

Security Checkpoint and TSA
Terminal 5 has well-organized TSA security lanes, including access to TSA PreCheck for eligible travelers. Wait times may vary, so it’s recommended to:

Arrive 2 hours early for domestic flights.

Arrive 3 hours early for international departures.

Have your boarding pass and valid ID ready.

Pack liquids in accordance with TSA's 3-1-1 rule.

https://airlinesofficesworld.com/frontier-airlines-lax-terminal-los-angeles-international-airport/