The calculated distance (air line) between Yaroslavl and Gavrilov-Yam is approximately 23 miles respectively 36 kilometers.
By car or train, the actual journey to Gavrilov-Yam is certainly longer, as only the direct route (as the crow flies) between Yaroslavl and Gavrilov-Yam has been calculated here.
Air line (approximately)
36 kilometers
20 nautical miles