The information can be one of the most important tools in estimating delays but is underutilized because most fliers aren't aware it exists. By taking note of the percentiles, you can play the odds to fit your travel plans. In most cases, flights between 6 and 9 a.m. depart about 80 to 90 percent on time. Afternoon flights start dropping to 50 to 70 percent. Most of the last flights of the day from connecting airports or hubs leave on time as much as 90 percent, but always look before you book.
Some routes are worse than others.
The next time you travel, be sure to check the on-time record of your flight number. In addition to getting cheap seats, you can maximize your chance of arriving on time.