Frontier Terminal Las Vegas Frontier Airlines uses Terminal 3 at Harry Reid International Airport (LAS). The terminal is located on the east side of the airport, and it is about a 10-minute walk from the main entrance. Frontier Airlines has a check-in counter in the terminal, as well as a gate area where passengers can wait for their flights. There are also a number of shops and restaurants in the terminal, so passengers can grab a bite to eat or do some shopping before their flight.