Last minute flights fares can vary significantly depending on a range of factors. Airlines use dynamic pricing algorithms to determine prices, which means that prices can fluctuate rapidly based on factors such as demand, time of day and week, and even weather conditions. Generally speaking, the closer you book to your departure date the higher the fare is likely to be. However, in some cases, airlines may offer last minute flights or flash sales to fill up empty seats on their flights. These deals are often available for a limited time only and may require flexibility with travel dates or times. It's also worth noting that booking last minute may limit seat availability or even force travelers to accept higher-priced options due to limited options. As such, it's important to weigh the costs and benefits before booking last minute flights fares.