The airport with the most flight delays is Dallas/Fort Worth International, with 25.42 percent of all flights pushed back this year so far. Severe thunderstorms seem to be the leading cause. Meanwhile, Denver International Airport trails behind, clocking in with 23.86 percent of flights delayed. Per KKTV11, 874 flights in and out of the hub didn’t take off or land on time on July 24 alone, with thunderstorms also being the main reason for the delays. In third place is Ronald Reagan Washington National at 23.29 percent. The airport is known for being “overburdened,” as its main runway sees over 800 takeoffs and landings a day. That’s more than any other runway in the country.