KAYAK tools

Why do flight prices change after you search?

3 min read

September 29, 2026

Flight prices can change between search and checkout. Here’s why that happens and how KAYAK tools can help you track fares, compare options and book with fewer surprises.

Why do flight prices change between search and checkout?

Airlines continuously adjust fares and seat availability based on factors such as demand, remaining inventory and booking activity. As a result, the price can change in the few minutes between searching for a flight and completing your booking.

Because airlines update fares based on changing demand and availability, it’s impossible to predict exactly when a specific fare will change. Here are some of the most common reasons:

1. Limited availability within fare categories.

Airlines divide cabins into fare categories, with each containing a set number of seats at a given price.…