The calculated distance (air line) between Nay Pyi Taw and Pyin Oo Lwin is approximately 160 miles respectively 257 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 Nay Pyi Taw and Pyin Oo Lwin has been calculated here.
Air line (approximately)
257 kilometers
139 nautical miles