The calculated distance (air line) between Jalasjärvi and Seinäjoki is approximately 21 miles respectively 33 kilometers.
By car or train, the actual journey to Seinäjoki is certainly longer, as only the direct route (as the crow flies) between Jalasjärvi and Seinäjoki has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles