A slew of flight delays hit San Francisco International Airport Saturday as runway construction resumed this holiday weekend, officials said.

As of 7 p.m. Saturday, 12 departing flights and nine arriving flights were canceled. Delays of up to an hour hit 125 departures and 189 arrivals, according to airport duty manager Maria Buyco.

The weekend construction was part of a project to pave SFO’s second-longest runway with a new asphalt surface.

It’s unclear, said airport duty manager Shawn Miyaki, whether the delays were a direct result of the construction — though the runway repairs did play a role.

In the meantime, travelers headed to the airport were advised to stay in contact with their airline.

“We always recommend contacting the airline prior to coming to the airport,” Miyaki said.

Hamed Aleaziz and Kimberly Veklerov are San Francisco Chronicle staff writers. Email: haleaziz@sfchronicle.com and kveklerov@sfchronicle.com Twitter: @haleaziz and @kveklerov