At some point, you’ve probably heard that booking flights at 2 a.m. is the secret to finding the cheapest deals. It’s a popular tip that has been circulating by word of mouth and social media for years. But is this advice true, or is it just another believable travel myth? It actually falls somewhere in the middle.

Airfare pricing isn’t random. It’s determined by artificial intelligence (AI) and machine learning systems that adjust prices in real time based on several factors that can change at any moment. While searching in the middle of the night doesn’t guarantee you’ll find the lowest fare, there are a few reasons why late-night searches can work in your favor.

Here are the real reasons why flight prices change, and how night owls might get lucky with a cheap fare if they know what t

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