Hi! Can you go by flight from Mandalay to Chiang Mai or Chian Rai
yes, to Chiang Mai but you have to go to Yangon first.
You can do either Mandalay-Bkk-Chiang Mai or Mandalay-Yangon-Chaing Mai.
Mandalay-Bkk flight is daily, but Yangon-Chaing Mai is only on Thurs and Sunday so far.