If you want to upgrade the ticket and process it, How do I upgrade my ticket at Allegiant Air? You can make your seat upgrade request by visiting the Manage Booking page or calling. Reservations Center/Customer Care: (702) 505-8888. How do I upgrade my ticket at Allegiant Air? ? go to the official website of allegiant airlines https://www.allegiantair.com/. ? After that, you will reach the official website; you can upgrade by filling in the details asked by clicking on the option of Manage Travel. And in this way, your ticket will be upgraded, and a message will come to you; you can contact for more information Reservations Center/Customer Care: (702) 505-8888. Allegiant Air upgrade: ? For allegiant air upgrade, go to the official website and manage travel, and there is an upgrade option. You will click on upgrade. In this way, you can upgrade your ticket. In addition, you can ask Reservations Center/Customer Care for more information: at (702) 505-8888. Allegiant Air customer service: ? The customer service of this airline works 24 hours a day; you can contact this number anytime. Reservations Center/Customer Care: (702) 505-8888. This entire blog has been told about the upgrade process of Allegiant Airlines. And I sincerely hope that you would have liked the information shared.!