Book cheap air tickets with Allegiant Airlines Customer Care. We include a wide range of airline services for our visitors and travelers. We are amongst the top-most airline service providers and are known for their classy traveling features. Customers can book or cancel reservations online through the Manage section of and can cancel or make changes to reservations by contacting Allegiant  Reservations Center at  +1 (702) 765-4833. The majority of individuals pick Allegiant  Airlines for their travel, because of our world-class services, comfort, and convenience