The calculated distance (air line) between Tena and Santo Domingo de los Colorados is approximately 107 miles respectively 172 kilometers.
By car or train, the actual journey to Santo Domingo de los Colorados is certainly longer, as only the direct route (as the crow flies) between Tena and Santo Domingo de los Colorados has been calculated here.
Air line (approximately)
172 kilometers
93 nautical miles