How to Modify Your Existing Allegiant Airlines Reservations?

However, the fee varies depending on the ticket.   Same-day flight changes :

1)   You can change an Allegiant Airlines reservations to a different time on the same day and it costs less. Also, customers can request a same-day flight change or standby online via their official website or at a self-service kiosk or even at the flight ticket counter.

2)   Same-day flight change fees may waive for customers that are flying with business, first-class or unrestricted economy class, Airpass tickets, Allegiant Airlines Advantage executive platinum status.

For this purpose:
 Click on the view/ change reservation tab on the home page of Allegiant Airlines official site. You can log in with your Allegiant Airlines Advantage number and password. Then, you need to click on the “Continue“ tab. If your flight is permitted to be changed, there will be a red “change flight “ tab on which you will have to click.
 After that, you can select your new flight criteria and click on the “Go” tab.
 A confirmation of your changes will be emailed to you on your mail-id.

If you cannot change your Allegiant Airlines reservations online, you can take the help of the airline’s customer service. For this purpose, you are required to call on the Allegiant airlines helpline number. For switching to a same-day reservation, you can also call on their helpline number which is available for 24 hours. You may also take the help of one of the airport representatives within the airport for changing your reservation. They will try their best to satisfy you if you talk nicely to them. l

If you did not book your ticket directly from their website, a fee may be applied. It is only possible if you booked your ticket through the third-party website or travel agent. So, it is recommended to check with them first for change options before modifying your existing reservations.

Blog source:

https://www.allegiant-flights-reservations.com/blog/allegiant-airlines-reservations-phone-number/