More than 100 flights through Denver International Airport were canceled Monday morning after an arctic blast plummeted temperatures and some snow fell overnight Sunday.

The flights, 79 departures from Denver and 99 arrivals to Denver, as of 12:20 p.m., account for about 10% of flights through Denver, according to FlightAware. Another 243 flights were delayed, including 128 departures, or 15% of the outgoing schedule.

Southwest Airlines has 127 cancellations on its schedule through Denver, the most of any airline, followed by SkyWest — which operates regional flights for major carriers — with 30 cancellations.

United Airlines has seven cancellations on its mainline flights, American Airlines has five cancellations, Frontier Airlines has four, CommutAir has two cancellations and Delta and NetJets Aviation has one flight canceled each.