Allegiant Air typically allows passengers to book flights 6 to 9 months in advance, depending on the route and travel season. Unlike larger airlines that publish year-round schedules, Allegiant releases its flight calendars in smaller batches. Since it’s a low-cost carrier, booking early often means getting the best deals — fares tend to rise as seats fill up. If your dates aren’t available yet, check back monthly or sign up for Allegiant’s email alerts for new schedule announcements.
