When viewing our Spirit Vacations packages, you view live inventory. Because prices are based on many factors, including availability of rooms/room types, flights and demand for the packages, prices can fluctuate, even within minutes. As it is not uncommon for prices to fluctuate, Spirit Vacations suggests that you check out different flights or alternate dates for a lower fare that may still be available. The only way to secure a vacation price is to pay for it in full.