Even if you're a world traveler with the biggest case of wanderlust ever, admit it: you still find intimidating. It's a complicated process, since there are so many airlines and prices are constantly fluctuating, making it impossible to determine if you're getting the best deal or not. But just answered the very complicated "when" to this question.
The airline booking website analyzed more than 1.2 million trips purchased in 2015 from the United States to 74 popular destinations across the world to determine how many days in advance you should secure your seat. As you can see, the results vary a lot and being further away doesn't always mean you should make an earlier purchase.
Another way to use this info? As reasoning for why you should plan a Mexican vacation for this summer. Flight prices are basically calling your name right now, after all.