| Boulogne-sur-Mer to Sangeorz-Bai | 1,065.28 mi (1,714.40 km) |
| Boulogne-sur-Mer to Sannicolau Mare | 926.02 mi (1,490.28 km) |
| Boulogne-sur-Mer to Santana | 955.19 mi (1,537.23 km) |
| Boulogne-sur-Mer to Satu Mare | 976.97 mi (1,572.29 km) |
| Boulogne-sur-Mer to Scobinti | 1,163.40 mi (1,872.31 km) |
| Boulogne-sur-Mer to Scornicesti | 1,143.35 mi (1,840.04 km) |
| Boulogne-sur-Mer to Sebes | 1,056.08 mi (1,699.60 km) |
| Boulogne-sur-Mer to Seini | 995.22 mi (1,601.66 km) |
| Boulogne-sur-Mer to Sfantu-Gheorghe | 1,154.89 mi (1,858.62 km) |
| Boulogne-sur-Mer to Sibiu | 1,086.29 mi (1,748.22 km) |
| Boulogne-sur-Mer to Sighetu Marmatiei | 1,017.55 mi (1,637.59 km) |
| Boulogne-sur-Mer to Sighisoara | 1,101.26 mi (1,772.31 km) |
| Boulogne-sur-Mer to Simeria | 1,035.35 mi (1,666.24 km) |
| Boulogne-sur-Mer to Sinaia | 1,160.50 mi (1,867.64 km) |
| Boulogne-sur-Mer to Slatina | 1,140.32 mi (1,835.16 km) |
