The calculated distance (air line) between Nizhniy Novgorod and Cheboksary is approximately 126 miles respectively 202 kilometers.
By car or train, the actual journey to Cheboksary is certainly longer, as only the direct route (as the crow flies) between Nizhniy Novgorod and Cheboksary has been calculated here.
Air line (approximately)
202 kilometers
109 nautical miles