The Allegiant Air Las Vegas Office is located at Harry Reid International Airport (LAS) and serves passengers flying with one of America's leading ultra-low-cost carriers. Conveniently situated within the airport, the office provides a range of essential services to help both departing and arriving travelers. The Las Vegas office offers ticketing services, including the ability to book, modify, and cancel flights. The dedicated staff at Allegiant is here to help you with any last-minute reservations.