Icy conditions caused delays and the cancellation of more than 20 flights at Bay Area airports this morning.

Southwest Airlines and Alaska Airlines held planes on the ground at Oakland International Airport earlier this morning because of ice and low temperatures, airport spokeswoman Rosemary Barnes said.

Southwest Airlines spokesman Brad Hawkins said five inbound flights to Oakland and 18 outbound flights from the airport have been canceled due to the weather.

Hawkins said the cancelled flights were all to or from airports west of Denver, with the majority of the delays affecting flights between Oakland and either San Diego or Los Angeles.

Those are “high-frequency routes, almost hourly, so all of our customers were accommodated on other flights near their scheduled times,” he said.

At Mineta San Jose International Airport, seven planes were delayed while they were “de-iced,” airport spokesman David Vossbrink said. He said the delays ranged from 10 minutes to an hour and a half.

The conditions are not as severe as Tuesday, when about 20 flights were delayed due to the near-freezing temperatures, Vossbrink said.

No delays have been reported at San Francisco International Airport.

Temperatures are expected to rise later this week, but the region will likely be hit by rain on Thursday, according to the National Weather Service.

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