The calculated distance (air line) between Ad Dīwānīyah and Al Fallūjah is approximately 115 miles respectively 185 kilometers.
By car or train, the actual journey to Al Fallūjah is certainly longer, as only the direct route (as the crow flies) between Ad Dīwānīyah and Al Fallūjah has been calculated here.
Air line (approximately)
185 kilometers
100 nautical miles