The calculated distance (air line) between Częstochowa and Zielona Góra is approximately 175 miles respectively 281 kilometers.
By car or train, the actual journey to Zielona Góra is certainly longer, as only the direct route (as the crow flies) between Częstochowa and Zielona Góra has been calculated here.
Air line (approximately)
281 kilometers
152 nautical miles