The calculated distance (air line) between Sa Pa and Hai Bà Trưng is approximately 158 miles respectively 254 kilometers.
By car or train, the actual journey to Hai Bà Trưng is certainly longer, as only the direct route (as the crow flies) between Sa Pa and Hai Bà Trưng has been calculated here.
Air line (approximately)
254 kilometers
137 nautical miles