The calculated distance (air line) between Tuyên Quang and Yên Bái is approximately 21 miles respectively 33 kilometers.
By car or train, the actual journey to Yên Bái is certainly longer, as only the direct route (as the crow flies) between Tuyên Quang and Yên Bái has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles