There are fairly cheap flights to SFO airport leaving LAX in the morning 9 ish and returning in the evening 9pm ish. Perfect for going to the SF intensives which are located just a 15 min cab ride from the airport. Check out Expedia.com or Priceline.com. The cheaper flights ($115 - $130 round trip) seem to be available 6 1/2 weeks or longer before the flight date but seem to increase in price ($200 or more) if you wait until the 5th week before booking the flight.