Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 05:45 and arrives at Yogyakarta Adisutjipto International Airport at 07:20.
The flighttime is about 1h 35m. The distance travelled ("as the bird flies"): 424 Km. So the average speed is roughly 268 Km.
The best month to arrive at Jakarta is November and the most expensive month to fly is December. (Average prices, based on 295 datapoints.)
We have a lot more statistics for flights QG 712 and between Jakarta and Yogyakarta.