1 OF 11Set up a Flight Tracker Price AlertGoogle Flights is a great tool to help you get started on your holiday travel planning. If you’re not quite ready to book your flight yet, you can set up an alert to receive regular updates when the price drops for your preferred route and dates. You can also see a calendar overview of the lowest-priced flights, so you can see if the cost is trending up or down. For Christmas flights, there will generally be a sharp increase in the price by the time late October rolls around. So while you may want to roll the dice and hope the cost of your flight will keep dropping, by October, it’s decision time.