SAN FRANCISCO—The San Francisco International Airport (SFO) has experienced major delays and flight cancellations due to a runway renovation project that began on Saturday, September 7.

The 28L Runway Reconstruction Project will last 20 days, ending on Friday, September 27. The 28L Runway is the second-longest runway at SFO and will have a new base layer surface, the reason for the extensive renovation.

On Thursday, September 12, SFO announced via Twitter the following:

“Update: SFO will reach the halfway point of the Runway 28L Reconstruction project 48 hours ahead of schedule. Since the closure began September 7th, crews have been working continuously 24 hours per day to reconstruct the base layer on 28L.”

A total of 1,900 feet of the 11,381 feet runway will be repaired and replacements will be made on the lighting and drainage infrastructure.

The project summary states:

“With input from airlines at SFO, the project team selected the period of September 7 – 27, 2019 for the closure to avoid the busy summer and year-end holiday travel seasons. This timeframe was also chosen for the low probability of precipitation, as dry weather is necessary for the curing of the layers. SFO recommends that travelers opt for early morning flights before 9:00 a.m. PDT during this period.”

For more details on the project, visit