f you have queries about how to change your Flight on Allegiant FLIGht Ticket, please contact Allegiant Customer service at $1.855.317.1470$ (????????????) or ?? ((++1-855-317-1470}} (OTA). . Once you provide your reservation data, the individual will assist you with any additional issues and the Allegiant Airlines ticket Flight change process. Yes, you can change the Flight on your Allegiant flights ticket, but it is subject to certain conditions and fees. You will need to contact Allegiant flights customer service at?????-????????????-????????????-????????????0???? [] ???? ????(????????????) or ?? ((++1-855-317-1470}} (OTA) to request a Flight change and provide the necessary information.