Frontier Airlines operates out of Terminal 3 at McCarran International Airport in Las Vegas. All of the Frontier Airlines arrival and departure terminals are located at Terminal 3. If you need to contact Frontier Airlines at Las Vegas Airport, you can visit their counter at Terminal 3 or call their customer service number. It is always best to check the most up-to-date information before your flight, as airline terminals can change. You can visit the official website of McCarran International Airport or contact Frontier Airlines directly for the latest terminal information specific to your flight. Additionally, signage and airport staff at McCarran International Airport can provide guidance on the location of Frontier Airlines check-in counters and gates.