Allegiant is a low-cost airline that provides scheduled flights to passengers worldwide. One can check their website and reserve a flight seat for the preferred destination. Sometimes, you want the top travel services and to board the flight to the higher travel class. In this situation, allegiant air allows you to upgrade the travel seat after the reservation. For this, travelers ask the way to upgrade my seat on Allegiant Air before the scheduled departure. You can check the details and upgrade your journey to a higher travel class. 

• Initially, you need to access the official web portal of allegiant air. 
• Afterward, you can tap on the manage booking handle available on the website. 
• At there, you need to provide the booking confirmation number with the passenger's last name.
• When you tap on the search button, you will see bookings with allegiant air on the next page.
• From that, you can choose the flight you want to upgrade the travel seat.
• With this, tap on the seat upgrade option from the drop-down list and proceed further.
• On the new screen, you need to choose the travel class; you want to upgrade the seat.
• From the given seat map, you can select the available seat for the number of travelers. 
• Once you tap on the continue tab, you need to make the payment and complete the process. 
• Allegiant Air will immediately send you the confirmation message with an updated e-ticket at your registered email ID. 

Apart from the above points, you can also communicate with customer service at allegiant air. You can talk to the representative and take their help with the allegiant air seat upgrade of your flight. For this, you can check the multiple ways to communicate with the representative available in their contact section. The customer service team is available round the clock to solve queries.