At least 846 flights were delayed or canceled at Denver International Airport on Thursday as snow fell in metro Denver and Colorado’s eastern plains.

According to the Federal Aviation Administration, the average delay time for arriving flights was less than 15 minutes. A traffic management program was in effect and FAA officials said it could delay some arriving flights and impact departing flight schedules.

According to Flight Aware, there were 837 delayed flights and nine cancellations at DIA as of 5:45 p.m. United Airlines reported the most delays with 268, followed by SkyWest with 229 and Southwest with 203.

That was down from Wednesday, when Flight Aware data showed 1,092 delays and 31 cancellations

“The thawing continues,” DIA spokesman Michael Konopasek said. “One runway is closed for treatment and cleaning.”