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