Airfare is the price paid for a route or combination of legs that make up a ticket.
Various things affect pricing, such as the supply of aircraft, demand from passengers, competitor pricing, and even the weather forecast and fleet maintenance schedule can impact published pricing.
In addition, airlines often create price discrimination between their most- and least-flexible fares, creating a complex web of pricing for each flight in its schedule. Airlines use complex revenue management systems to revise prices daily and often hourly.
Currently, data shows that given unpredictable supply and demand, prices are fluctuating more than ever, creating an inefficient market for travel. Notwithstanding taxes and fees, net air travel prices are likely to continue to be less predictable in the future.