An NYPD bodyguard for Mayor Bill de Blasio and his family drove the mayor's son to Connecticut on Saturday to begin his freshman year at Yale University, a City Hall spokesman said later in the day.

The mayor canceled plans to join Dante de Blasio, his younger child, on the trip, as had originally been indicated on the mayor's public schedule.

Dante de Blasio, 17, changed his mind about his parents coming along for the ride to New Haven because he wanted the day to be "low key," according to spokeswoman Erin White.

White said he will be attending "pre-orientation" first and the mayor and his wife, Chirlane McCray would bring more of the teen's possessions to the Yale campus sometime soon.

In 2013, the biracial 17-year-old's starring role in a campaign commercial, on race and policing, is credited with helping his dad clinch the Democratic nomination for mayor.

Earlier Saturday, the mayor relayed feeling pangs of bittersweet joy that Gracie Mansion would be an empty nest.

advertisement | advertise on newsday

"I'm experiencing my last few hours of having a child living in my home. You know, I'm certain I will be crying at different points today," he said at an unrelated event, adding: "And there's going to be tears of joy at the same time."

The 109th mayor's only son graduated in June from the prestigious Brooklyn Technical High School. He was accepted to all 10 universities to which he applied, but he narrowed his choices to Yale and Brown University, in Providence, Rhode Island, the mayor's office said in April.

In remarks Saturday to kickoff a 5k run in Harlem, the mayor received applause when he mentioned his son.

"I'm going to miss him every single day," the mayor said. "I'm getting ready for that separation moment in a few hours."

De Blasio's older child, Chiara de Blasio, 20, attends Santa Clara University in California. The mayor's late father, Warren Wilhelm Sr., was a 1939 Yale graduate.