The calculated distance (air line) between Kauniainen and Jyväskylä is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Jyväskylä is certainly longer, as only the direct route (as the crow flies) between Kauniainen and Jyväskylä has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles