Flight International Airport departs from Los Angeles International Airport at 06:00 and arrives at San Francisco International Airport at 07:41.
The flighttime is about 1h 41m. The distance travelled ("as the bird flies"): 487 Km. So the average speed is roughly 289 Km.
The best month to arrive at Los Angeles is October and the most expensive month to fly is July. (Average prices, based on 256 datapoints.)
We have a lot more statistics for flights UA 2139 and between Los Angeles and San Francisco.