The calculated distance (air line) between Ḩadīthah and Al Fallūjah is approximately 98 miles respectively 157 kilometers.
By car or train, the actual journey to Al Fallūjah is certainly longer, as only the direct route (as the crow flies) between Ḩadīthah and Al Fallūjah has been calculated here.
Air line (approximately)
157 kilometers
85 nautical miles