Pros

Seamless booking and trip management: The Allegiant app lets you search and book flights, reserve seats, add bags, and purchase extras quickly. Manage reservations, check in from your phone, access mobile boarding passes, and store payment or traveler profiles—putting full itinerary control in one place for fast, on-the-go travel planning.

Exclusive savings and bundled vacations: The Allegiant app surfaces app-only fares, flash discounts and bundled vacation packages combining flights, hotels and car rentals. With curated deals, promo notifications and straightforward package checkout, the app helps budget-conscious travelers discover lower fares and create complete, money-saving itineraries in minutes.

Real-time alerts and airport convenience: The Allegiant app delivers push notifications for flight status, gate changes, delays and boarding reminders, plus quick access to customer support and add-on services like seat upgrades or baggage purchases. Timely updates and in-app tools reduce stress and save time during travel disruptions or last-minute adjustments.

Cons

Allegiant's app reflects the airline's low-cost model: fewer daily flights and limited routes to secondary airports. That limits flexibility for travelers seeking last-minute changes or nonstop options, often requiring connections or inconvenient schedules compared with major carriers, especially on popular travel dates and for frequent flyers.

The Allegiant app may display low base fares but adds mandatory fees for baggage, seat selection, and other services. If users don't closely review add-ons during booking, the final price can be significantly higher, making fare comparisons with other airlines harder and causing surprise costs at checkout.

Some users report the Allegiant mobile app has usability issues—glitches during booking, limited payment options, sparse real-time notifications, and minimal in-app customer support. These limitations can make managing reservations, changes, or refunds more time-consuming, especially during peak travel periods or when schedule disruptions occur.