When planning a trip, one of the biggest challenges is finding affordable flights. Airfare can fluctuate dramatically, and many factors can influence prices, such as the season, the time of day, and how far in advance you book. However, studies have shown that there is one day of the week when flights tend to be cheaper than others. Airlines typically release new fare deals on this day, and competing airlines adjust their prices to match, creating a window of opportunity for travelers looking for the best deals.