The calculated distance (air line) between Fontaine-l'Évêque and Saint-Gilles is approximately 29 miles respectively 47 kilometers.
By car or train, the actual journey to Saint-Gilles is certainly longer, as only the direct route (as the crow flies) between Fontaine-l'Évêque and Saint-Gilles has been calculated here.
Air line (approximately)
47 kilometers
25 nautical miles