Planning travel for next year? The 2025 Spirit Airlines low fare calendar is already proving to be a great resource for early planners. It displays month-by-month pricing so travelers can book in advance and lock in the lowest fares. Early bookings often bring better deals, especially for popular routes. Keep checking the calendar as new dates and updates roll out. If you're planning family trips, solo adventures, or business travel, using this feature can lead to huge savings.