The calculated distance (air line) between Saint-Omer and Paris 20 Ménilmontant is approximately 130 miles respectively 210 kilometers.
By car or train, the actual journey to Paris 20 Ménilmontant is certainly longer, as only the direct route (as the crow flies) between Saint-Omer and Paris 20 Ménilmontant has been calculated here.
Air line (approximately)
210 kilometers
113 nautical miles