This is the most common "win." If you need 60,000 miles for a flight but only have 57,000, buying those last 3,000 miles is often worth it to secure the booking.

Buying miles at their "sticker price" (without a bonus) is almost always a losing game. You will likely pay 2–3 cents per mile for something worth only 1–1.5 cents. How to Calculate the Value

Before buying, do this quick math provided by experts at Chase :Divide the by the number of miles required .

In the world of travel hacking, there is one universal rule: . Miles are not an investment; they are a currency that airlines can (and do) devalue at any time without notice. If you buy 100,000 miles today with no plan, you might find that the 80,000-mile flight you wanted suddenly costs 120,000 miles tomorrow. When It’s Actually Worth It

We’ve all seen the flashy emails from airlines: "Limited Time: Get a 100% Bonus When You Buy Miles!" It sounds like a dream deal—a shortcut to that first-class seat you’ve been eyeing. But before you enter your credit card info, you need to know that . However, "usually" isn't "always." The Golden Rule: Only Buy What You Need