The calculated distance (air line) between Al Fallūjah and Imam Qasim is approximately 89 miles respectively 144 kilometers.
By car or train, the actual journey to Imam Qasim is certainly longer, as only the direct route (as the crow flies) between Al Fallūjah and Imam Qasim has been calculated here.
Air line (approximately)
144 kilometers
78 nautical miles