The reality is pricing changes all the time. The general rule of thumb for timing, however, is that booking flights at the last minute is more expensive than booking at least a few weeks in advance. But there are always exceptions — you might get super lucky and find a bargain on last-minute flights.

In 2026, the specific "time of day" you click the "buy" button matters much less than the day of the week you fly and how far in advance you book. For years, there was a popular myth that booking at 3:00 AM on a Tuesday would net you the lowest price, but modern airline pricing is now controlled by sophisticated AI algorithms that adjust fares in real-time based on demand, competitor pricing, and historical trends. However, some patterns still hold true: booking about 1 to 3 months in advance for domestic flights and 4 to 8 months for international trips generally offers the best value. As for the flight itself, the time of day you depart matters significantly; "Red-eye" flights (late night) and the very first flights of the morning (5:00 AM–6:00 AM) are almost always cheaper than mid-day or evening slots because they are less convenient for the average traveler. Furthermore, mid-week departures (Tuesdays and Wednesdays) are consistently cheaper than Friday or Sunday flights. While "clearing your cookies" is another common tip, it has little impact today; instead, using tools like Google Flights' "Track Prices" feature is the most effective way to catch a price drop, as it monitors those AI-driven fluctuations for you 24/7.