In the event that you're hoping to change your flight on Allegiant Air, there are a couple of things you really want to be aware. In the first place, you'll have to call the airline directly and address a customer service representative. You'll likewise should pay the change fee, which can be quite costly. At last, make certain to have all of your relevant data helpful, including your reservation confirmation number and the contact information for the person who booked your flight. How can i change my flight on Allegiant Air? Read the full blog or Dial: +1-702-505-8888 or OTA: +1-888-894-2072.