Yes, Allegiant Air Offers The Option To Choose Your Seats When You Book A Flight. When You Book A Flight, You Will Be Able To Select From Available Seat Options And Can View Seat Maps For The Plane That You Are Flying With. Allegiant Air Seat Selection You Can Also Upgrade To A Preferred Seat Or Choose A Comfort Or Priority Seating For A Fee. On Some Flights, Allegiant Air Also Offers Larger Seats For An Additional Fee. 

Allegiant Air's Seat Selection Policy Varies Depending On The Specific Flight. Generally, Passengers Can Purchase Pre-Reserved Seats At The Time Of Booking, New Seat Assignments Are Charged At Check-In, And Seats Can Be Upgraded Via Online Check-In. Additionally, Passengers Who Do Not Initially Select A Seat May Be Assigned A Seat At Check-In Based On The Aircraft Configuration Elevate Members Receive Priority Seating With Certain Seats Blocked Off During The Initial Check-In Window.