The calculated distance (air line) between Haukipudas and Seinäjoki is approximately 181 miles respectively 292 kilometers.
By car or train, the actual journey to Seinäjoki is certainly longer, as only the direct route (as the crow flies) between Haukipudas and Seinäjoki has been calculated here.
Air line (approximately)
292 kilometers
158 nautical miles