Flight International Airport departs from San Francisco International Airport at 11:45 and arrives at Tokyo Narita International Airport at 14:50.
The flighttime is about 11h 05m. The distance travelled ("as the bird flies"): 10813 Km. So the average speed is roughly 976 Km.
There is an 16 hour time difference between San Francisco and Tokyo
The best day to arrive at San Francisco is Sunday and it would be best to avoid Friday, as prices are on average 3200.41% higher than on Sunday. (Average prices, based on 19423 datapoints.)
We have a lot more statistics for flights UA 837 and between San Francisco and Tokyo.