It's going to be a rough September for passengers using San Francisco's airport. Officials at San Francisco International Airport (SFO) have made the decision to close the airport's busiest runway for repairs. It will take 20 days for workers to replace the current runway with new concrete. Travelers are being warned that delays could be common throughout the period lasting from Sept. 7 to Sept. 27.

What do we know about what the delay situation will look like at SFO this month? The picture isn't a pretty one. The runway that is being shut down for 20 days serves 68 percent of SFO's flights. Airport officials are anticipating that all flights taking off after 9 a.m. will experience delays lasting between 30 and 45 minutes. In addition, there is a good chance that some flights will be delayed by two hours.

Carriers are doing their best to ease stress at SFO in the face of anticipated delays. United Airlines has already announced to customers that it plans to waive all change fees during the 20-day closure. United passengers account for roughly 45 percent of all traffic at SFO.

It doesn't appear that Alaska Airlines plans to follow in the footsteps of United. The carrier is simply recommending that customers sign up for notifications to be alerted of delays before leaving for the airport.

What can you do to prepare if you'll be flying out of SFO in September? Showing up as early as possible is always recommended. Airport officials are suggesting that passengers try to book early morning flights. It is expected that delays will typically start after 9 a.m. during the runway closure.

Scott Dylan is a contributing writer at GET.com and has been to (almost) every country in North, Central and South America with nothing more than a backpack, a laptop and the desire to explore. He speaks Spanish fluently and has logged enough time in planes, trains, rideshares, buses, taxis and rickshaws to know how to rack up rewards and points to get anywhere his heart desires for pennies on the dollar. Email: scott.dylan@get.com.