The carrier canceled nearly 350 flights as of 9 a.m. ET, according to flight tracker FlightAware. Meanwhile, more than 300 flights have already been delayed, according to the data.
Even still, the Texas-based carrier told FOX Business in an updated statement Monday morning that it is running "closer to normal operation" despite facing continued weatherchallenges.
"Although we have some new weather in parts of our system, today's operation has vastly improved from the weekend, with a much smaller number of cancellations linked to our weekend recovery efforts," the carrier said.