Flight Kuala Lumpur International Airport departs from Kuala Lumpur Kuala Lumpur International Airport at 12:00 and arrives at Chiang Mai Chiang Mai International Airport at 13:50.
The flighttime is about 2h 50m. The distance travelled ("as the bird flies"): 439 Km. So the average speed is roughly 155 Km.
There is an 1 hour time difference between Kuala Lumpur and Chiang Mai