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DENVER — Airlines canceled more than 1,300 flights in and out of Denver International Airport for Wednesday as a blizzard moved into Colorado. There were 74 delays.

There were 1,386 canceled flights into, out of and through DIA on Wednesday, according to FlightAware.

Denver is under a blizzard warning until midnight Wednesday with up to 12 inches of snow and winds gusting to 70 mph possible.

Southwest Airlines canceled 371 flights in and out of DIA starting at 8:30 a.m. Wednesday. That’s 91 percent of its total for the day at the “all-weather” airport.

Southwest has “proactively canceled nearly all operations from Denver International Airport” on Wednesday, the airline said.

RELATED: Denver International Airport arrivals and departures

United Airlines issued a travel waiver for Wednesday and Thursday for travel through DIA and other Rocky Mountain and Plains airports. It began canceling flights late Tuesday afternoon.

“We are monitoring the weather closely,” United said.

United had canceled 310 flights, or 77 percent of its total for the day. SkyWest Airlines scrubbed 244 of its flights, or 86 percent of its total for the day.

Frontier Airlines said flights to, from and through DIA and Colorado Springs were also being scrapped.

“We continue to evaluate the weather situation and as of now expect that many of our Denver flights on Wednesday late morning, afternoon and early evening will not operate,” Frontier said in a statement.

Frontier had canceled 79 flights, or 72 percent of its total for the day.

DIA said passengers should check with their airline to confirm flight status before going to the airport. Passengers are encouraged to arrive at least two hours before their flight.

The airport will have more than 500 people and more than 250 pieces of equipment working on snow removal.