Harry Reid International Airport’s Terminal 3 is home to What Terminal is Alaska Airlines at LAS . Serving both domestic and international aircraft, facility 3 is the airport’s newest and most sophisticated facility. With the needs of travelers in mind, it provides a plethora of facilities, roomy seating areas, and cutting-edge technology to guarantee a hassle-free and enjoyable journey. Terminal 3 is the best terminal for both short- and long-haul flights for Alaska Airlines passengers since it provides simple navigation and rapid access to gates.