The calculated distance (air line) between Al Musayyib and Al Fallūjah is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Al Fallūjah is certainly longer, as only the direct route (as the crow flies) between Al Musayyib and Al Fallūjah has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles