DENVER (KDVR) — Over 400 flights are delayed at Denver International Airport on one of the busiest travel days of the year. As millions head home after the holidays or go on a newly unwrapped vacation, travelers will be met with long security lines and full flights. Aurora woman helps elderly neighbor having stroke; draws donations from across the country According to DIA officials, the holiday travel buzz is expected to last through the new year, but Friday is expected to be among its busiest days. An estimated 83,307 passengers will travel through security checkpoints on Friday, just shy of 2024’s highest totals. Officials at DIA said the busiest hours of the day will be 8 a.m. and 4 p.m., with the highest volume of passengers going through security daily from: 6 a.m. to noon 3 p.m. to 6 p.m. With those long security lines, travelers at DIA are being met with delayed and even some canceled flights. According to FlightAware, at 7 p.m., 414 flights were delayed and 18 were canceled. Southwest had a majority of the delays with 139 impacted flights, and United was a close second at 135 impacted flights. While Denver has over 400 delays, DIA is not the worst airport in the U.S. as of 7 p.m. According to FlightAware's Misery Map, DIA was fifth, with the worst airport being Chicago O'Hare. Ring in 2025 at these New Year’s Eve events in Denver At 2:15 p.m., DIA said the South Security checkpoint had a 21-minute wait with a 12-minute TSA PreCheck wait. West Security had a 7-minute wait and a 5-minute TSA PreCheck wait. Wait times do fluctuate nearly every minute, so travelers can check the status of the two security checkpoints on DIA's website. Travelers can check their flight information with their airline or on DIA's website.