SAN FRANCISCO (KRON) – If you’re traveling through San Francisco International Airport anytime soon, be ready for flight delays!

A key runway will be closed for nearly a month for repairs.

Monday marks the third consecutive day of a 20-day closure of 2-8 left runway that will be repaired.

Usually, when they have runway maintenance, they’re just putting a new asphalt layer on but this particular runway, the bas layer was failing to cause it to crack.

A new base will be built along the 1,900-foot stretch to where that runway meets the intersection of another runway affecting both departures and arrivals.

They haven’t done work like this on this runway in about 50 or 60 years.

“Flight delays are expected to average 30-45 minutes, with some flights experiencing maximum delays of approximately 2 hours,” SFO said in a statement.

The project is expected to end Friday, Sept. 27.

SFO officials said on Saturday, 244 flights were delayed and more than a hundred were canceled, mostly due to the project.

To check the airport delay status, click here for more information.

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