The calculated distance (air line) between Sơn La and Tuyên Quang is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to Tuyên Quang is certainly longer, as only the direct route (as the crow flies) between Sơn La and Tuyên Quang has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles