If you’re planning a trip further out than what Google has prices listed for, you can use the lowest fares graph to somewhat accurately predict how prices are going to fluctuate from month to month. In addition, you can set flight preferences, such as direct flights only, to only see prices for flights that meet your needs. If you make all your selections, but Google determines there’s a cheaper option available, it will tip you off to cheaper dates or cheaper routes just to make sure you’re satisfied with what you have chosen. Get the full story at Google