The calculated distance (air line) between Şimleu Silvaniei and Suceava is approximately 164 miles respectively 263 kilometers.
By car or train, the actual journey to Suceava is certainly longer, as only the direct route (as the crow flies) between Şimleu Silvaniei and Suceava has been calculated here.
Air line (approximately)
263 kilometers
142 nautical miles