The Lowest Fares Calendar displays a range of fare buckets for each day, color‑coded to suggest relative price levels. However, those colors reflect only the lowest published fare at the moment of the query, not the final price after taxes, baggage fees, or possible fare changes before you book. Additionally, the calendar pulls data from the airline’s inventory system, which can be updated multiple times a day, so a “green” day today may turn amber by evening.
Because Southwest’s fares are dynamic and often tied to load factor, the calendar can hide the fact that a slightly higher base fare might include a free checked bag, whereas the lowest‑priced option could charge for every piece. Understanding these hidden variables helps you decide whether the displayed low fare truly aligns with your travel budget and comfort preferences overall.