The calculated distance (air line) between Longueau and Paris 19 Buttes-Chaumont is approximately 68 miles respectively 110 kilometers.
By car or train, the actual journey to Paris 19 Buttes-Chaumont is certainly longer, as only the direct route (as the crow flies) between Longueau and Paris 19 Buttes-Chaumont has been calculated here.
Air line (approximately)
110 kilometers
59 nautical miles