EXPLORE THE FARE THEORYStart with the ideas behind airfare, award travel, flight value, and smarter travel decisions.

Learn when upgrades, award flights, premium seats, and other travel extras are actually worth it.
Most flight searches begin with a straightforward question: how much does it cost to fly from one city to another?…

Most travel websites tell you where to go or which credit card to use.
The Fare Theory explains why airfare changes, how airlines make pricing decisions, and how you can use that knowledge to make better travel decisions.
Whether you’re paying cash, redeeming miles, or deciding if an upgrade is worth it, our goal is simple:
Help you think like the airline, not just the traveler.
Why Would Airlines Sell More Tickets Than They Have Seats? Imagine you’re booking a flight with 180 seats. It would only seem logical that once passenger #180 buys a ticket, the airline should stop selling tickets. But that’s not necessarily…
Why JetBlue Is Launching BlueFirst? JetBlue is officially entering the domestic first-class market. The airline unveiled BlueFirst on September 1, 2026, a new premium cabin that will begin appearing on JetBlue aircraft later this year. And it’s a pretty significant…
Does aircraft type matter when booking a flight? The answer is yes, but probably not for the reasons most travelers think. Aircraft type can influence cabin layout, seat configuration, noise, cabin environment and the overall onboard experience. But the airplane…
When booking a flight from Bali to Tokyo, I faced a decision familiar to points-and-miles travelers: How should I think about KrisFlyer miles value…by maximizing cents per point, or by maximizing the value of the trip itself? I had several…
What Does Seat Pitch Mean? Imagine two rows of airplane seats. Instead of measuring from the edge of your seat to the seatback in front of you, seat pitch measures from a fixed point on one seat to the same…