The calculated distance (air line) between Myingyan and Pyin Oo Lwin is approximately 79 miles respectively 128 kilometers.
By car or train, the actual journey to Pyin Oo Lwin is certainly longer, as only the direct route (as the crow flies) between Myingyan and Pyin Oo Lwin has been calculated here.
Air line (approximately)
128 kilometers
69 nautical miles