The calculated distance (air line) between Pyay and Mawlamyinegyunn is approximately 169 miles respectively 272 kilometers.
By car or train, the actual journey to Mawlamyinegyunn is certainly longer, as only the direct route (as the crow flies) between Pyay and Mawlamyinegyunn has been calculated here.
Air line (approximately)
272 kilometers
147 nautical miles