TheSpirit Airlines Low Fare Calendar assists travelers to locate the cheapest days to fly by in the briefest possible time by showing an entire month of fares at a single spot. You will be able to compare the data on the lowest price per date at a glance as opposed to daily checking. Just put in your route, select the flexible date feature and the calendar will display the best offers around. It is the tool to choose when you have some freedom in your plans of traveling and do not want to pay the peak prices of the travel.