Spoiler alert: It’s probably not for the reason you think.
I’m still surprised by how often people ask if airfares will drop if they wait to book. Some even believe that prices go up just because they’ve searched online a few times—thanks to “sneaky algorithms.”
But here’s the real reason:
Airlines sell seats in pricing tiers within each cabin class (e.g. First, Business, Premium Economy, Economy). Each cabin has multiple fare levels, and only a certain number of seats are sold at each price point.
Once the cheapest fares in a cabin are sold out, the system moves to the next tier—which is more expensive—even though the seat itself is physically the same. There are often differences in the fare rules or flexibility, but again the physical seat remains the same.
For example, on the image here of the October 6th flight from Sydney to London Heathrow (QF001), there are 9 seats available at the X-class fare in Economy, then 9 at the O-class fare, and so on. In Premium Economy, the lower fare classes (T and R) are sold out, so the only option left is the more expensive W-class fare. The same goes for Business Class: D and I fares are gone, so now only the higher-priced J and C fares remain.
So, why wait to book?
If you want the lowest price in your preferred cabin, it’s smart to book early—before those lower-tier fares sell out.
