Flight Narita International Airport departs from Tokyo Narita International Airport at 11:15 and arrives at Jakarta Soekarno–Hatta International Airport at 17:05.
The flighttime is about 7h 50m. The distance travelled ("as the bird flies"): 4356 Km. So the average speed is roughly 556 Km.
There is an 2 hour time difference between Tokyo and Jakarta
The best day to arrive at Tokyo is Monday and it would be best to avoid Saturday, as prices are on average 219.41% higher than on Monday. (Average prices, based on 12838752 datapoints.)
We have a lot more statistics for flights AS 7345 and between Tokyo and Jakarta.