Timing is everything when reserving flights — especially business class. Whereas economy flight prices are typically unreliable, business class flight prices are. For international business class flights, the best time usually is 70 to 90 days in advance. Reserve too early and you pay full fare, reserve too late and you have poor availability or crazy prices. When traveling domestically, you might have to be more flexible, but if you can reserve your fare at least 30 days in advance it usually works. Predicting prices ahead of and further down the line will enable you to have a fabulous bargain when you notice it — some of the best way to book flights at discount.