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All the airlines work on a yield management system. The system calculates an airfare based on such factors as the season, local events, competition, time of the year and many more. The demand for an individual flight route at one of such times is then calculated into a percentage of airfares that are available. By means of figures from previous similar circumstances, that is the same time last year, the airfare is calculated based upon the natural demand that should arise. To put it simply, the earlier you book your tickets the better the price you will get, although in some cases it is possible to find cheaper flights after the earliest possible time to book, usually because the metrics used to calculate the original price have changed.