Flight Narita International Airport departs from Tokyo Narita International Airport at 18:45 and arrives at Chitose New Chitose Airport at 20:35.
The flighttime is about 1h 50m. The distance travelled ("as the bird flies"): 623 Km. So the average speed is roughly 340 Km.
The best day to arrive at Tokyo is Saturday and it would be best to avoid Wednesday, as prices are on average 365.91% higher than on Saturday. (Average prices, based on 1195164 datapoints.)
We have a lot more statistics for flights JL 3049 and between Tokyo and Chitose.