Sometimes cheap flights are going to be found early in advance. This is used in cases where a person might get a good deal when a flight first opens up and a carrier wants to offer some useful deals. This is used for cheap flights because some companies want to promote their services with some discounts for those who get them well in advance. This also helps to keep vacancies at a minimum. This is similar to what is found on some cruises deals because it helps to keep a flight ready without worrying about any difficult expenses when regularly booking a flight.